On a more minor note, when I get a TlsException connecting to a server with a self-signed certificate, I get multiple levels of TlsExceptions (4 total). Each exception has an inner exception that is another TlsException with the exact same message ("Server certificate was rejected by the verifier because of an unknown certificate authority"). My guess is there are several levels inside Rebex code that catch TlsException and instead of rethrowing wrap it inside a new TlsException. This doesn't cause any particular problem, but it might be nice to clean up at some point.