SharePoint loopback check

Loopback check is not a Sharepoint issue. It is a feature introduced by Windows server after Server 2003 SP1 to enhance its security. It has caused a series of problems in recent months.

The main scenarios are:

1. The SharePoint site uses the Host header ).

2. Access the SharePoint site locally.

3. install any of the following patches:

• 1. Accumulated IE security patches (kb963027)
• 2. Internet Explorer 8.
• 3. Windows Server 2008 Service Pack 2.

 

The problem is that the system prompts you to log on when you visit the website. after entering the correct information three times, the system reports error 401.1.

The solution is to disable loopback check. Detailed steps are available in kb896861 (http://support.microsoft.com/kb/896861.

Or click the image below to download a tool and fix it.

Fix this problem
Microsoft fix it 50306

Other Derivative Problems include the unavailability of SharePoint enterprise search, which can be solved in the same way. Because by default, crawling is local.