SharePoint Disable Loopback Check

SharePoint Disable Loopback Check

PROBLEM:

SharePoint continues to prompt for the username and password when running under the local server, and may not accept the username and password when running from the local server.

RESOLUTION: 

1.  Specify the host names in the registry - BackConnectionHostNames (more secure and recommended for PRODUCTION servers). Refer http://support.microsoft.com/kb/896861

2. Disable the loopback check - DisableLoopbackCheck (less secure and recommended for DEVELOPMENT environments). Read on to use this method 2 and add via an easy powershell cmd.

 

You would need to create a DWORD registry key in the registry called DisableLoopbackCheck and set it to 1.

Option 1: Add this registry entry by PowerShell

New-ItemProperty HKLM:\System\CurrentControlSet\Control\Lsa -Name "DisableLoopbackCheck" -value "1" -PropertyType dword

Option 2: Add this registry entry manually

Click Start, click Run, type regedit, and then click OK

In Registry Editor, locate the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

Right-click Lsa, point to New, and then click DWORD Value. (In Win 2008, its DWORD 32bit)

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.

You may need to restart your server.

For more information about this, click the following article number to view the article in the Microsoft Knowledge Base: 281308 (http://support.microsoft.com/kb/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.