Sunday, 26 June 2011

SharePoint 2010 - Unable to login through windows prompt (loopback issue)

Recently I was attempting to log into an extended SharePoint web application that had been configured for Claims Based Authentication.  The problem being that I was unable to login when prompted for credentials.

Turns out it was a loop back problem.  This can be fixed through a change to the registry. Which can be done manually or through some PowerShell.

New-ItemProperty HKLM:\System\CurrentControlSet\Control\Lsa -Name "DisableLoopbackCheck" -value "1" -PropertyType dword


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