I talked with you yesterday. This problem is hard to diagnose due to the number of different factors that can come into play. You were getting socket timeouts showing up in the client log and one of the possible reasons that I said mentioned was port exhaustion on the server. This is by no means the definite cause, it was just an idea for something to look at.
You can view all of the tcp connections on the server several different ways. One way is through the resource monitor which you can get to by opening the taskbar, clicking the performance tab the clicking the Resource Monitor button. The networking tab will show you TCP Connections. You can also download a tool from Microsoft called TCPView which you can get here http://technet.microsoft.com/en-us/sysinternals/bb897437.aspx