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Sudden 401.1 on my SharePoint VM

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Mark Harrison

Posts: 3775
Nickname: mharrison
Registered: Dec, 2003

Mark Harrison is Microsoft UK Systems Engineer focussing on .NET eBiz and Portals
Sudden 401.1 on my SharePoint VM Posted: May 29, 2009 2:00 AM
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After a recent Windows Update I started to get challenged for credentials when trying to access several SharePoint applications. After three attempts, I am given a 401.1 error.

This now happens for sites that have host headers that don't match the machine name.

I had to add a registry entry at

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0

with a multi-sting value BackConnectionHostNames that contains a list of SharePoint sites host headers

Read: Sudden 401.1 on my SharePoint VM

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