Loopback Check Tool
Simple tool to enable, disable and configure the Loopback check function in Windows Server.
The preferred way is to add all URLs to the excluded list, this will allow the Loopback ckeck to remain enabled and you will still be able to access Web Application locally on the server.
Place this tool on your server and you never have to disable the loopback check again!

Please note! Remember that this tool will alter the registry directly, it will only touch the specified registry keys that handle the LoopbackCheck functionality and can in no way do anything else, but nontheless, be warned. Registry will be touched and a complimentary warning is in Place, if you want to be absolutely 100% sure that no harm is done, do a backup before even starting this tool.
Keys affected:
Key: HKLM:\System\CurrentControlSet\Control\Lsa               Value: DisableLoopbackCheck
Key: HKLM:\System\CurrentControlSet\Control\Lsa\MSV1_0 Value: BackConnectionHostNames

Tool Form

  Referenses to the Loopback check tool and what it does:

You receive error 401.1 when you browse a Web site that uses Integrated Authentication and is hosted on IIS 5.1 or a later version
A quick guide to configuring the Loopback check
DisableLoopbackCheck & SharePoint: What every admin and developer should know.
Thomas Balkeståhl


Last edited Dec 16, 2013 at 7:30 AM by Balken, version 11