Connection reset by peer

Help me, please, in solving of such problem:
I
'm using SQUID-2.2.STABLE2 proxy server on BSD/OS 2.1
When clients try to connect to some hosts (e.g. www.winfile.com,
www.tucows.com, ftp://ftp.xilinx.com) through proxy server, either such
message appears:

READ ERROR
(54) Connection reset by peer

or "connection timed out" message.
Though, when clients connect to these sites directly (not through proxy),
there is no problems
Received on Fri May 21 1999 - 04:50:38 MDT