Try CVS -t LOGIN to see what CVS is trying to send. Are you using PSERVER, SSH, or something else? Not sure that I can help, but others might with this info. >>> "Robert Balahura" <[EMAIL PROTECTED]> 06/08/00 01:10AM >>> I am using WIN NT to login to a LINUX CVS SERVER when I type CVS LOGIN at the c prompt I get a "UNKNOWN HOST" error. I have everything set up according to the documentation, and I can ping my host machine so I'm not sure what the problem is. Has anyone solved this when they started using cvs from NT environment?