I've encountered a slow network transfer problem recently on my Windows 2003 server (30 users network). There seems to be delay whenever a user transfer file to the server and sometimes it fail to transfer. It wasn't always like this so I'm suspecting the problem is cause by recent changes I made or by a virus.
Changes made recently
-migrate all user local pst to reside on the server.
-updated my antivirus
Server performance seem to be normal, but I really think something is exhausting the connections on the server.
Other possibilities:router, switch, and nic
Please help me narrow down and fix this problem.
Thanks in advance.