Authentication for web service (401 error returned)

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A webservice I need to use, is protected by a simple username/password IIS authentication (in IE a username / password dialog pops up when traveling to the Web Service's URL).

The problem is, that I can't seem to log on to the web service with BizTalk 2004 as I can not see any properties to set in my orchestration or the Port that I use.

The BizTalk 2004 server I use is running in it's own domain, so the user that BizTalk Server is running has, will never have direct access to the webservice.

In short: Is there a way to authenticate yourself with a webservice in BizTalk 2004? Calling the web service using a Expression, maybe? Authenticate with a expression just before calling the webservice itself?
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