We have a number of linux system and the cvs directories are mounted from a server running linux. If a checkin is done on a remote m/c sometimes it dosen't work. I think it might have something to do with system time but I'm not sure.
FWIW, Red Hat routinely uses cvs to access remote repositories using :pserver: or :ext: access without problems. You should check: 1) both the client and server are running the same version of cvs. 2) the times between the client and server should be kept in sync 3) you should *not* try to access the remote cvs server using NFS. The linux nfs server has some issues. Use :pserver: or :ext: access instead -- both of theses types of remote access are faster. 4) I've also seen cvs have some difficulties checking out into a nfs directory. Please reopen this bug with more complete information on how to reproduce your problem if the above suggestions do not help.