I'm seeing a spurious CannotConnect error from the AS5.0.0.CR2 remoting code, specifically from method HTTPClientInvoker.useHttpURLConnection. The exception is actually caused by a NPE thrown after dispatching the message. The problem occurs in a JaxWS-based test program which sends a one way message which it expects the server to barf on. The server duly throws a wobbly (ok, it throws a WebServiceException) and the http call gets a 500 code. At line 330 useHttpURLConnection fetches an InputStream from the connection. This turns out to be null since this is a one way message. The null pointer is passed to readResponse at line 356 and the resulting NPE is caught at line 385. This problem does not normally manifest because it is masked as soon as a request-reply message is dispatched using the same connection. The request-reply exchange appears to supply a value the return data InputStream and so subsequent one way exchanges don't suffer the NPE. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4184536#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...