I'm having some issues on a Windows 2008 server with some network connections not going through. For instance, in a web application on the server, we need to open a socket connection to another server, and this fails sometimes with the following message:

Only one usage of each socket address (protocol/network address/port) is normally permitted

I looked up the error, which led me to this page: http://msdn.microsoft.com/en-us/library/aa560610(v=bts.20).aspx, which indicates that it might be TCP/IP port exhaustion.

When I perform netstat -n, I get tons of TIME_WAIT connections on port 80.

Does anyone have any idea what could be causing this?