We just ran into a problem with our application connecting to an Ssl based webservice.
Our app worked fine on our Windows 2003 Server however when we put it in the live environment which was Server 2008, it failed.

After going through the whole shabang, we determined it be the  .Net ServicePointManager needing to be set to use SSL3 security protocol.
Oddly enough when checking the protocol in Server 2008, it displayed using Ssl3. However you still need to set it?!
Here is the code we placed before calling the webservice thas solved the problem.

// required to be explicitly set in Vista / Server 2008

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Ssl3;

Other related error messages:
Received an unexpected EOF or 0 bytes from the transport stream.