Http Error 401.1 error when accessing MOSS 2007 site from Web Front End

Posted by Michał Juśkowiak | Posted in | Posted on 04:53

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When you've finished configure all farm settings after new installation check if your web applications are accessible from your's Web Front Ends. If you receive below error:
"HTTP Error 401.1 – Unauthorized: Access is denied due to invalid credentials" don't be sad, because Microsoft have two solutions for this type of issue. I have always use method 1.

Method 1: Disable the loopback check
  1. Set the DisableStrictNameChecking registry entry to 1.
  2. Click Start, click Run, type regedit, and then click OK.


  3. In Registry Editor, locate and then click the following registry key:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

  4. Right-click Lsa, point to New, and then click DWORD Value.
  5. Type DisableLoopbackCheck, and then press ENTER.
  6. Right-click DisableLoopbackCheck, and then click Modify.
  7. In the Value data box, type 1, and then click OK.
  8. Quit Registry Editor, and then restart your computer.
Method 2: Specify host names
To specify the host names that are mapped to the loopback address and can connect to Web sites on your computer, follow these steps:
  1. Set the DisableStrictNameChecking registry entry to 1.
  2. Click Start, click Run, type regedit, and then click OK.


  3. In Registry Editor, locate and then click the following registry key:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0

  4. Right-click MSV1_0, point to New, and then click Multi-String Value.
  5. Type BackConnectionHostNames, and then press ENTER.
  6. Right-click BackConnectionHostNames, and then click Modify.
  7. In the Value data box, type the host name or the host names for the sites that are on the local computer, and then click OK.
  8. Quit Registry Editor, and then restart the IISAdmin service.
Source: http://support.microsoft.com/kb/896861/en-us

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