Sign In

Disabling Loopback Check

Saru Ponnusamy Senior SharePoint Consultant
Mar 01, 2010

When we have external resources or if we want to point to the local resources instead, we can add entries on the hosts file. But, at times while browsing locally on the server that has links to external resources will throw an 401.2 authentication error because of the loopback that is enabled by default.

To avoid this, we need to add a new DWORD on the registry as described below:

  • Start->Run->Regedit
  • Navigate to HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Control -> Lsa
  • Add a new DWORD, "DisableLoopbackCheck" if it is not already present
  • Modify the value to 1
  • Restart the server

Now, the external resources would resolve as expected. Also note that this will also solve the WSS Crawl error (#2436).

Call

WebKMS Consultants Diary

On this Consultants Diary column, we share some of the problems we faced and how we solved for the benefit of our readers. We hope you find this real-world solutions useful and appreciate your interest and valuable feedback.

We update this column frequently, and encourage you to come back as often as you can.

We would also be glad to welcome if you have any specific request and we will try our best to post a solution on this column.

Doc collaboration Enterprise Intranet