Error: Too many connections (on Windows 2003 Server)

We are trying to setup a new PowerEdge 750 server with Standard edition Windows 2003 server.

When network computers try to log into the Server they get an error message saying they can't log in because there are "too many connections"  How do we correct this error or why are we getting it?

Only about 15 computers trying to log in.

Also, next problem, We have a couple computers running Windows 98 trying to log in. One computer was able too but the other one is persistant in saying it can't establish a connection. Any ideas.

Thanks,

Marshall

PowerEdge 750 Rack optimised

2.8Ghz Pentium 4 processor

1GB Memory

Windows 2003 Server, standard edition