I have created software for my company that automatically generates FedEx shipping labels by implementing FedEx's web services. I have completed FedEx's process of testing, etc. and have been approved to move on to production. From the computer I used to develop the software, everything works fine. I can successully create FedEx labels with no problems. However, as soon as I deployed the software on two other client workstations, the software does not work. The error that is returned when calling the web service is:
"The underlying connection was closed. An unknown error occured during a send."
All of the workstations are running Windows XP SP3 and .NET 3.5 SP1, and the software was written in VB.NET.
Anybody know what might be causing this?