'HTTP Error 401.1 - Unauthorized: Logon Failed' While Connecting a Site Using AD Integration

Overview

At times, the following error is received while browsing the WindowsSignin.aspx page on a site that relies on Active Directory integration:

This article provides a reference article you can follow to resolve the error mentioned above.

Information

The issue mentioned above has also been reported in a Microsoft article: 'You receive error 401.1 when you browse a Web site that uses Integrated Authentication'; however, the link to this article is temporarily unavailable.

Therefore, you can fix the issue by applying any of the workarounds mentioned in the Stack Overflow article: Windows Authentication not working on local IIS 7.5. Error 401.1.