Having issue logging-in to SharePoint (MOSS) with Windows Authentication but it works when setting it to Basic Authentication mode?
This issue was also discussed in October 12, 2010 Security Update http://support.microsoft.com/kb/2345212/
“Users are prompted for authentication when they try to browse a SharePoint site. Windows Server 2003 SP1 and Windows Server 2008 include a loopback check security feature that helps prevent reflection attacks on your computer. Therefore, authentication fails if the fully qualified domain (FQDN) or the custom host header that you use does not match the local computer name.”
Resolution
To resolve this issue, disable the authentication loopback check. To do this, follow these steps:
- Click Start, click Run, type regedit, and then click OK.
- Locate and then click the following registry subkey:
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.
- Exit Registry Editor.
- Restart the computer.
