Getting HTTP 401.1, Unauthorized: Logon Failed, or multiple login requests from a SharePoint site you're developing? One simple solution is to disable the LSA loopback check in Windows. This is a quick video that walks you through the necessary steps.
Caution: Modifying the registry can cause serious problems with your machine, so it might be a good idea to backup your registry before making any changes.
Disable Loopback Check
Run the windows Registry Editor (regedit.exe) and navigate to the key:
- Right click Lsa and select New, then DWORD Value.
- Enter DisableLoopbackCheck as the name and hit ENTER.
- Double-click DisableLoopbackCheck and enter 1 as the Value data and click OK.
- Reboot your machine for the change to take effect.