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Troubleshooting HTTP 401 Error when WebUI site is inaccessible
Browsing to the login screen results in one of the following errors:
- A standard browser/IIS error stating:
HTTP Error 401.2 - Unauthorized
You are not authorized to view this page due to invalid authentication headers
- A branded Internal Audit screen containing the text:
401 - You are not authorized to access this resource
This normally occurs after changing the authentication method from FBA to Windows Authentication, and is caused by an inappropriate combination of authentication types enabled and disabled in IIS.
The tables below show the correct configurations for each site. In each case, authentication types not required should be disabled:
Where the desktop application authenticates via Windows and the WebUI via FBA:
| Site | Authentication types to enable |
| FBA | Anonymous, Forms |
| Service | Anonymous, Forms |
| WebService | Anonymous, Forms |
| WebUI | Anonymous, Forms |
Where the desktop application and the WebUI both authenticate via Windows:
| Site | Authentication types to enable |
| FBA | Anonymous, Forms |
| Service | Anonymous, Forms |
| WebService | ASP.NET Impersonation, Windows |
| WebUI | ASP.NET Impersonation, Windows |