How do I integrate SAP R/3 with an external system?

Hi there!

I've run into a problem integrating SAP R/3 with an external system. The external system provides a webservice, and when I try to get WSDL file from that service, I am getting asked of authorization and when I authorize, I get error 500. The access is anonymous, as I'm being told. When I try to get just a response, server requests authorization. No matter what login and password I supply, I always get error 401 saying I'm not authorized.

I think the ICF is somewhat misconfigured, but how do I configure it? Or maybe there's a problem with requests I send. I don't know.

Please help!

Regards, Dima