Network subsystem unavailable

[E B]

While running the command (on windows 2000)
cvs -d:pserver:address@hidden:/home/cvsroot co -c
from with a java program(jdk1.3.1), I am getting the
following error:
cvs [checkout aborted]: cannot create socket: Unknown 
socket error: 10106

on some machines it says
Network subsystem unavailable.

Any idea when would cvs give these errors?

thanks

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