<PAGE>
Exhibit 23.3
CONSENT OF INDEPENDENT AUDITORS
-------------------------------
We consent to the reference to our firm under the caption "Experts" and to
the use of our report dated February 8, 2000, with respect to the financial
statements of Metamor Worldwide, Inc. incorporated by reference in Amendment No.
1 to the Registration Statement (Form S-3) and related prospectus of PSINet Inc.
for the registration of 16,500,000 shares of its Series D cumulative convertible
preferred stock.
/s/ Ernst & Young LLP
Houston, Texas
July 18, 2000
