Disable the authentication loopback check for SharePoint

Disable the authentication loopback check

Re-enable the behavior that exists in Windows Server 2003 by setting the DisableLoopbackCheck registry entry in the

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa registry

subkey to 1. To set the DisableLoopbackCheck registry entry to 1, follow these steps on the client computer:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey: 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. Exit Registry Editor.
8. Restart the computer.

http://support.microsoft.com/kb/926642?wa=wsignin1.0