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We have a Sharepoint 3.0 Install running on Server 2008R2, and users are suddenly getting requests for credentials every-time they try and access documents. The prompt bounces back as though the credentials are invalid even though they are not. It will even lock the user's account out. Odd thing is they can cancel out of the prompt and still access the file. Where would I start to troubleshoot this?
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We have a Sharepoint 3.0 Install running on Server 2008R2, and users are suddenly getting requests for credentials every-time they try and access documents. The prompt bounces back as though the credentials are invalid even though they are not. It will even lock the user's account out. Odd thing is they can cancel out of the prompt and still access the file. Where would I start to troubleshoot this?

Constant Requests for Credentials when accessing documents

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.

Microsoft SharePoint

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.