How do I diagnose SDK client connection problems?

Hi,

I'm using the .NET SDK to connect to my hosted Thingworx Server. I was able to connect to my local test Thingworx Server but now my client app hangs on the client.start() method. I think it's something to do with encryption but I can't get any output from the SDK because it never returns from the start method. How do I log connection problems so I can find out what the problem is? Is there any logging built in to the SDK itself?

Regards,

Greg