I am using a RestClient app to communicate with my WCF service .and I am getting the following exception
The underlying connection was closed: An unexpected
I dont't know if is the same error, but in my case, the exception was in Json, that cannot convert the Date value, because it was empty.
DateTime values that are greater than DateTime.MaxValue or smaller than DateTime.MinValue when converted to UTC cannot be serialized to JSON.
The trace viewer was very useful to find the issue.