WCF Tracing. How I can get the exact reason for closing connection?

Question

In my WCF service, when trying transfer large data I constantly get an error: The underlying connection was closed: The connection was closed unexpectedly

Answer 1

You should get a specific communication exception on the client side. I think that this exception that you're describing is an exception that is thrown after trying to reuse the client after it has faulted.

Try this:

1. On the server side config file set includeExceptionDetailInFaults="true"
2. When you're using the client side don't use the 'using pattern'. Check out this article.

I don't think you need tracing. Try the above and you'll be able to see the exact communication error.

Oh, and BTW is your client is Silverlight application? If so then it's a bit more complicated... Check out this article.