.NET Remoting and Server 2003

Question

Hello everyone,
There doesn't seem to be an appropriate section for this question. Sorry if this is the wrong place.

I've created a WinForms app that uses .NET remoting to communicate with a Windows Service (also custom created using .NET). It works great on every operating system I've tried it on. On one particular Server 2003 Standard system though, the Remoting doesn't work. The client application and service are both running but the communication doesn't seem to work.

I've tried doing the remoting with a TCP connection (tried both ports 60001 and 9250) and an HTTP connection (port 1077) and no luck. The software gave a .NET CLR error and wouldn't run when in HTTP mode.

All I know about the server (it's a customer's) is that it's running Citrix.

Anyone have any ideas?

Thanks in advance!