401 Unauthorized Access Denied in MOSS 2007 when using hostname/ host header – Cannot Login on MOSS site

For a short assignment, I had to jump back to MOSS 2007 and while setting up the MOSS environment on Windows Server 2003, I came across a showstopper which I didn’t face before.

When create a site collection and specify a host header for it, it doesn’t let you login no matter what (Even if you are 100% sure that the credentials are correct). Anyways. I was lucky that others have faced the same problem and figured out that it was due to Service Pack on Windows Server 2003.

Solution:

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.

*Thanks to Koen who gave this simple solution.

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