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SharePoint Training Team Blog: SharePoint 2010 Local Website Access – Loopback Fix May 1, 2012

Posted by John Ruby in Solutions, Troubleshooting & Knowledge Bases.
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Cause
Windows Server 2003 SP1 introduced a loopback security check. This feature is also present in Windows Server 2008 R2.
The feature prevents access to a web application using a fully qualified domain name (FQDN) if an attempt to access it takes place from a machine that hosts that application. The end result is a 401.1 Access Denied from the web server and a logon failure in the event log.
Another problem is that the search crawler failing
Resolution

Apply the fix mentioned in http://support.microsoft.com/kb/896861 only for DEV environments.
Method 2: Disable the loopback check
To set the DisableLoopbackCheck registry key, follow these steps:

  1. Click Start, click Run, type regedit, and then click OK.
  2. In Registry Editor, locate and then click the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
  3. Right-click Lsa, point to New, and then click DWORD Value.
  4. Type DisableLoopbackCheck, and then press ENTER.
  5. Right-click DisableLoopbackCheck, and then click Modify.
  6. In the Value data box, type 1, and then click OK.
  7. Quit Registry Editor, and then restart your computer.

SharePoint Training Team Blog: SharePoint 2010 Local Website Access – Loopback Fix

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