Overview

When a user browses to a site and they receive a 401.3 error message " HTTP 401.3 Unauthorized site is not loading. " This article will detail how to resolve this error.

Prerequisites

• Access to the DNN Web Server and IIS

Diagnosis

This issue occurs when the DNN root folder does not have the correct permissions and the configuration for IIS authentication needs to be configured correctly.

Solution

1. In Windows, open the root DNN folder of your website. Right-click on the folder > Click Folder Properties > Security. Make sure that the folder has permissions for the Network Service Group.
2. Make sure that in IIS > Click on your site > 'Authentication > Anonymous Authentication' is enabled.
3. Make sure that in IIS > Click on your site > Basic settings > Connect as > 'Application User' is selected.

Testing

Access the site with any user, they should not receive the 401.3 unauthorized error.