BizTalk 2010 SharePoint Adapter 401.2 Unauthorized errors

Got BizTalk 2010, SharePoint 2010 and HTTP 401.2 Unauthorized errors? On a recent project we were having problems configuring the Windows SharePoint Services Adapter onto a SharePoint 2010 farm. This is basically a BizTalk 2010 web service that gets deployed to your SharePoint farm. It allows BizTalk to deposit documents into SharePoint document libraries. The adapter was deployed and configured without error, but when calling the web service from BizTalk it generated HTTP 401.2 Unauthorized err…

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