Thursday
Oct222009
DisableLoopbackCheck for SharePoint
Thursday, October 22, 2009 at 2:26PM When you use the fully qualified domain name (FQDN) or a custom host header to browse a local Web site that is hosted on a computer that is running Microsoft Internet Information Services (IIS) 5.1 or a later version, you may receive an error message that resembles the following:
HTTP 401.1 - Unauthorized: Logon Failed or in a SharePoint portal you get three login attempts and then a blank page.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
Fix it for me
To set the DisableLoopbackCheck registry key automatically, click the Fix this problemlink. Click Run in the File Download dialog box, and then follow the steps in the Fix it wizard.
Fix this problem
Microsoft Fix it 50306
Let me fix it myself
To set the DisableLoopbackCheck registry key yourself, follow these steps:
- Set the DisableStrictNameChecking registry entry to 1. For more information about how to do this, click the following article number to view the article in the Microsoft Knowledge Base:
281308 Connecting to SMB share on a Windows 2000-based computer or a Windows Server 2003-based computer may not work with an alias name
- Click Start, click Run, type regedit, and then click OK.
- In Registry Editor, locate and then click the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
- Right-click Lsa, point to New, and then click DWORD Value.
- Type DisableLoopbackCheck, and then press ENTER.
- Right-click DisableLoopbackCheck, and then click Modify.
- In the Value data box, type 1, and then click OK.
- Quit Registry Editor, and then restart your computer.
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Reader Comments (2)
Hey,
I had a similar problem with this, just wondering what would be the deal if you use the Microsoft tool, the registry can be recovered if you do it manually, but if you install the Microsoft Fix It, is there a way to go back?
And Thanks for the info!!!
Hi Richard,
The Microsoft tool just makes the Reg entries for you if you wanted to roll back you would have to go into the registry and delete the new Key.
Sean