SocketException : connection reset when calling remote WS

Hello,
I’m trying to use Webmethods Developer 7.1 to invoke a remote SOAP web service located on a remote server. This remote service is fully functional, and i can use it with a SOAP client (SOAPUI for instance).

When I run my connector based on this service, i just keep receiving java.net.SocketException. Everything seems fine, the address of the web service in my WSDL is correct, as is the request I send to the service.

Am I missing something ?