DNS

My prob is this…when I bring a new win2k box onto the network, I have our main server(file, logon, dns…etc….) as the primary address in DNS settings and the university server as secondary (different domain). I set it up this way first, so I can join the domain. Once I have joined the domain, I set the DNS settings to point to the main servers in the university so that my users can get out to the net. However, anytime my users need to change a password, etc… the error message says “path not found”. When I place our server in the primary DNS again, it will work but then no internet access. How do I set it so that I don’t need to do this anymore? I have been looking through articles on forward lookup zones and such but I am not clear if this is the same issue.
Thanks in advance.

Mike