CANAAN VENTURES II LIMITED PARTNERSHIP
SC 13G/A, 1999-02-12
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<PAGE>   1
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13G
   

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
 
                         (AMENDMENT NO.      ONE        )*
                                       -----------------

                          Concord Communications, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                          Common Stock, $.01 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    206186108
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 1998
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

    [ ] Rule 13d-1(b)
    [ ] Rule 13d-1(c)
    [X] Rule 13d-1(d)


*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).





                               Page 1 or 21 pages

<PAGE>   2

- --------------------------                        ------------------------------
 CUSIP NO.  206186108                 13G          PAGE    2    OF   21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Canaan Ventures II Limited Partnership

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware Limited Partnership

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                0
                                
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 0
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        0

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        PN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 2 of 21 pages


<PAGE>   3
- -------------------------                        ------------------------------
 CUSIP NO.  206186108                 13G          PAGE    3    OF   21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Canaan Ventures II Offshore C.V.

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Netherlands Antilles Limited Partnership

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                0   
                                
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 0
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        0

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        PN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 3 of 21 pages




<PAGE>   4


- --------------------------                        ------------------------------
 CUSIP NO.  206186108                 13G          PAGE    4    OF   21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Canaan Offshore Management, N.V.

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Netherlands Antilles Corporation

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                0
                                
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 0
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        0

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        CO

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 4 of 21 pages


<PAGE>   5
- -------------------------                         ------------------------------
 CUSIP NO.  206186108                 13G          PAGE    5   OF    21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Canaan Ventures Partnership II L.P.

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware Limited Partnership

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                0   
            
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 0
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        0

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        PN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 5 of 21 pages




<PAGE>   6
- -------------------------                         ------------------------------
 CUSIP NO.  206186108                 13G          PAGE    6   OF    21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Harry T. Rein

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                1,828  
                                
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 1,828
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        1,828

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        IN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 6 of 21 pages


<PAGE>   7
- -------------------------                         ------------------------------
 CUSIP NO.  206186108                 13G          PAGE    7   OF    21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        James J. Fitzpatrick

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                0 
                                
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 0
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        0

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        IN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 7 of 21 pages


<PAGE>   8

- -------------------------                         ------------------------------
 CUSIP NO.  206186108                 13G          PAGE    8   OF    21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Stephen L. Green

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                16,904  
                                
        SHARES            ---- ------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 16,904
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        16,904

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        IN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 8 of 21 pages



<PAGE>   9

- ------------------------                         ------------------------------
 CUSIP NO.  206186108                 13G          PAGE    9   OF    21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Deepak Kamra

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                24,662
                                
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 24,662
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        24,662

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        IN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 9 of 21 pages

<PAGE>   10
- -------------------------                         ------------------------------
 CUSIP NO.  206186108                 13G          PAGE   10   OF    21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Gregory Kopchinsky

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                10,000    
                                
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 10,000
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        10,000

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        IN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 10 of 21 pages


<PAGE>   11
- -------------------------                         ------------------------------
 CUSIP NO.  206186108                 13G          PAGE   11   OF    21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Robert Migliorino

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                20,904   
                                        
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 20,904
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        20,904

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        IN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 11 of 21 pages




<PAGE>   12

- -------------------------                         ------------------------------
 CUSIP NO.  206186108                 13G          PAGE   12   OF    21   PAGES
          --------------                                -------    -------
- --------------------------                        ------------------------------
 
- ------- ------------------------------------------------------------------------
  1     NAME OF REPORTING PERSON
        S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Eric A. Young

- ------- ------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                         (a) [ ]
                                                         (b) [ ]

- ------- ------------------------------------------------------------------------
  3     SEC USE ONLY


- ------- ------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States

- ------- ------------------------------------------------------------------------
                           5    SOLE VOTING POWER

       NUMBER OF                31,904
                                
        SHARES            ---- -------------------------------------------------
                           6    SHARED VOTING POWER
     BENEFICIALLY          
                                0  
       OWNED BY                
                          ---- -------------------------------------------------
         EACH              7    SOLE DISPOSITIVE POWER
                  
      REPORTING                 31,904
                  
        PERSON            ---- -------------------------------------------------
                           8    SHARED DISPOSITIVE POWER
         WITH                  
                                0
             
- ------- ------------------------------------------------------------------------

  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        31,904

- ------- ------------------------------------------------------------------------

 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

                                                                          [ ]

- ------- ------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        less than five percent (5%)

- ------- ------------------------------------------------------------------------

 12     TYPE OF REPORTING PERSON *

        IN

- ------- ------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 12 of 21 pages


<PAGE>   13


Item 1(a).     NAME OF ISSUER

               Concord Communications, Inc.

Item 1(b).     ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES

               33 Boston Post Road West 
               Marlboro, MA 01752

Item 2(a).     NAME OF PERSON FILING

               This statement is filed by Canaan Ventures II Limited
               Partnership, a Delaware limited partnership, ("Canaan Ventures
               II"), Canaan Ventures II Offshore C.V., a Netherlands Antilles
               limited partnership, ("Canaan Ventures II Offshore"), Canaan
               Offshore Management, N.V., a Netherlands Antilles corporation
               ("Canaan Corporation"), Canaan Venture Partners II L.P., a
               Delaware limited partnership, ("Canaan Partners") and Harry T.
               Rein, James J. Fitzpatrick, Deepak Kamra, Stephen L. Green,
               Gregory Kopchinsky, Robert J. Migliorino, and Eric A. Young
               (collectively, the "Partners"). Canaan Partners (which serves as
               the sole general partner of Canaan Ventures II and one of the two
               general partners of Canaan Ventures II Offshore), Canaan
               Corporation (which serves as the other general partner of Canaan
               Ventures II Offshore), and the Partners (who serve as general
               partners of Canaan Partners), are collectively referred to as the
               "Reporting Persons" in this Schedule 13G.

Item 2(b).     ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE

               Except in the case of Canaan Ventures II Offshore, Canaan
               Corporation, Deepak Kamra and Eric A. Young, the principal
               business address of the Reporting Persons is 105 Rowayton Avenue,
               Rowayton, CT 06853. The principal address of Canaan Ventures II
               Offshore and Canaan Corporation is c/o ABN Trustcompany,
               Pietermaai 15, Curacao, the Netherlands Antilles. The principal
               business address of Deepak Kamra and Eric A. Young is 2884 Sand
               Hill Road, Suite 115, Menlo Park, CA 94025.

Item 2(c).     CITIZENSHIP

               Canaan Ventures II and Canaan Partners are limited partnerships
               organized under the laws of Delaware. Canaan Ventures II Offshore
               is a limited partnership and Canaan Corporation is a corporation,
               each organized under the laws of the Netherlands Antilles. Each
               of the Partners are citizens of the United States.

Item 2(d)      TITLE OF CLASS OF SECURITIES

               This Schedule 13G report relates to the Common Stock, par value
               $.01 ("Common Stock") of Concord Communications, Inc. ("the
               Company").



                              Page 13 of 21 pages


<PAGE>   14

Item 2(e).     CUSIP NUMBER

               CUSIP number 206186108.

Item 3.        IF THIS STATEMENT IF FILED PURSUANT TO RULES 13D-1(b), OR
               13D-2(b), CHECK WHETHER THE PERSON FILING IS A:
        
               None.

Item 4.        OWNERSHIP
               Not applicable. The foregoing percentages are based on the
               12,958,472 shares of Common Stock reported to be outstanding in
               the Quarterly Report on Form 10-Q of the Issuer for the quarter
               ended September 30, 1998.

Item 5.        OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS 
               This statement is being filed to report the fact that as of the
               date hereof, the Reporting Persons have ceased to be the
               beneficial owners of more than five percent (5%) of the class of
               securities.

Item 6.        OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
               Not applicable.

Item 7.        IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
               ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
               COMPANY

               Not applicable.

Item 8.        IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
               Each of the Reporting Persons expressly disclaims membership in a
               "Group" as defined in Rule 13d-1 (b) (ii) (J).

Item 9.        NOTICE OF DISSOLUTION OF GROUP
               Not applicable.

Item 10.       CERTIFICATION
               Not applicable. This Schedule 13G is not filed pursuant to Rule
               13d-1(b).

DATE:  February 10, 1999.

                             Page 14 of 21 pages


<PAGE>   15

                                   SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, each of the
undersigned certifies that the information set forth in this statement is true,
complete and correct.


Canaan Ventures II Limited Partnership
By:     Canaan Venture Partners II L.P.
        Its General Partner

By:                   *                 
        -------------------------------                        
        General Partner


Canaan Ventures II Offshore C. V.
By:     Canaan Venture Partners II L.P.
        Its General Partner

By:                   *                                  
        -------------------------------                        
        General Partner


Canaan Offshore Management, N.V.

By:                   *                                  
        -------------------------------                        
        Director


Canaan Ventures Partners II L.P.

By:                   *                                  
        -------------------------------                        
        General Partner




                             Page 15 of 21 pages


<PAGE>   16



                  *                                  
- ---------------------------------------                        
Harry T. Rein


                  *                                  
- ---------------------------------------                        
James J. Fitzpatrick


                  *                                  
- ---------------------------------------                        
Stephen L. Green


                  *                                  
- ---------------------------------------                        
Deepak Kamra


                  *                                  
- ---------------------------------------                        
Gregory Kopchinsky


                  *                                  
- ---------------------------------------                        
Robert J. Migliorino


                  *                                  
- ---------------------------------------                        
Eric A. Young


                                                *By:  /s/ Guy M. Russo         
                                                      --------------------------
                                                      Guy M. Russo
                                                      Attorney-in-Fact

- --------------------------------------------------------------------------------

This Schedule 13G was executed by Guy M. Russo pursuant to Powers of Attorney a
copy of which is filed herewith as Exhibit 2.







                             Page 16 of 21 pages



<PAGE>   1

                                                                      EXHIBIT 1

                             JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934,
as amended, the undersigned agree that only one statement containing the
information required by Schedule 13G need be filed by each of the undersigned
with respect to the ownership by each of the undersigned of shares of stock of
Concord Communications, Inc. This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original.


Canaan Ventures II Limited Partnership
By:     Canaan Venture Partners II L.P.
        Its General Partner

By:                   *                                  
        -------------------------------                        
        General Partner


Canaan Ventures II Offshore C. V.
By:     Canaan Venture Partners II L.P.
        Its General Partner

By:                   *                                  
        -------------------------------                        
        General Partner


Canaan Offshore Management, N.V.

By:                   *                                  
        -------------------------------                        
        Director


Canaan Venture Partners II L.P.

By:                   *                                  
        -------------------------------                        
        General Partner




                             Page 17 of 21 pages



<PAGE>   2






                  *                                  
- ---------------------------------------                        
Harry T. Rein


                  *                                  
- ---------------------------------------                        
James J. Fitzpatrick


                  *                                  
- ---------------------------------------                        
Stephen L. Green


                  *                                  
- ---------------------------------------                        
Deepak Kamra


                  *                                  
- ---------------------------------------                        
Gregory Kopchinsky


                  *                                  
- ---------------------------------------                        
Robert J. Migliorino


                  *                                  
- ---------------------------------------                        
Eric A. Young


                                                *By: /s/ Guy M. Russo 
                                                     ---------------------------
                                                         Guy M. Russo
                                                         Attorney-in-Fact

- --------------------------------------------------------------------------------

This Schedule 13G was executed by Guy M. Russo pursuant to Powers of Attorney a
copy of which is filed herewith as Exhibit 2.





                            Page 18 of 21 pages




<PAGE>   1



                                                                       EXHIBIT 2


                                POWER OF ATTORNEY


     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints Guy M. Russo his true and lawful
attorney-in-fact and agent, with full power of substitution and resubstitution,
for him and in his name, place and stead, in any and all capacities (until
revoked in writing) to sign any and all instruments, certificates and documents
required to be executed on behalf of himself as an individual or in his capacity
as a general partner or authorized signatory, as the case may be, on behalf of
any of Canaan Ventures II Limited Partnership; Canaan Ventures II Offshore,
C.V.; Canaan Offshore Management, N.V. or Canaan Venture Partners II, L.P.
pursuant to the Securities Act of 1933, as amended, (the "Securities Act"), or
the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and any
and all regulations promulgated thereunder and to file the same, with all
exhibits thereto, and any other documents in connection therewith, with the
Securities and Exchange Commission, and with any other entity when and if such
is mandated by the Securities Act, the Exchange Act or by the By-laws of the
National Association of Securities Dealers, Inc., granting unto said
attorney-in-fact and agent full power and authority to do and perform each and
every act and thing requisite and necessary fully to all intents and purposes as
he might or could do in person thereby, and ratifying and confirming all that
said attorney-in-fact and agent, or his substitute or substitutes, may lawfully
do or cause to be done by virtue hereof, or may have done in connection with the
matters described above.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]











                            Page 19 of 21 pages


<PAGE>   2
                                                                      Page 20 of

IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 29th day of
January, 1998.

CANAAN VENTURES II LIMITED PARTNERSHIP

By:     Canaan Venture Partners II, L.P.
        Its General Partner

By:     /s/ Harry T. Rein                             
        -------------------------------                        
        General Partner


CANAAN VENTURES II OFFSHORE C.V.

By:     Canaan Venture Partners II, L.P.
        Its General Partner

By:     /s/ Harry T. Rein                             
        -------------------------------                        
        General Partner


CANAAN OFFSHORE MANAGEMENT, N.V.

By:     /s/ Harry T. Rein                              
        -------------------------------                        
        Director


CANAAN VENTURE PARTNERS II, L.P.

By:     /s/ Harry T. Rein                              
        -------------------------------                        
        General Partner



                            Page 20 of 21 pages


<PAGE>   3




/s/ Harry T. Rein                                   
- ---------------------------------------                        
Harry T. Rein


/s/ James J. Fitzpatrick                            
- ---------------------------------------                        
James J. Fitzpatrick


/s/ Stephen L. Green                                
- ---------------------------------------                        
Stephen L. Green


/s/ Deepak Kamra                                    
- ---------------------------------------                        
Deepak Kamra


/s/ Gregory Kopchinsky                              
- ---------------------------------------                        
Gregory Kopchinsky


/s/ Robert J. Migliorino                            
- ---------------------------------------                        
Robert J. Migliorino


/s/ Eric A Young                                     
- ---------------------------------------                        
Eric A. Young





                            Page 21 of 21 pages


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