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HTTP Error 401.0 - Unauthorized

Question / Problem

HTTP Error 401.0 - Unauthorized

Answer / Solution

The 'Forms Authentication' is not activated in the 'Windows Features' for the web site (similar to error code 401.2). Activate the 'Forms Authentication' in the 'Windows Features' and for the web site via the IIS-Manager:

  1. Open the Server Manager.
  2. On the dashboard select the entry 'Add Roles And Features'.
  3. Click on 'Server Selection'.
  4. Click on 'Server Roles'.
  5. Navigate to 'Web Server (IIS)' > 'Web Server' > 'Security' and enable the 'Windows Authentication'.
  6. Click on 'Next' until the button 'Install' appears. Enable the checkbox 'Restart the destination server automatically if required' and press 'Install'.
  7. After the installation press the button 'Close' and try to execute the SpaceObServer Web Access in your browser again.

Enable the Windows Authentication:

  1. Open the IIS-Manager (inetmgr).
  2. In the left pane, open 'Sites' and select the 'SpaceObServer Web Access'.
  3. In the middle pane in the section 'IIS' doubleclick 'Authentication'.
  4. Select 'Forms Authentication'. In the right pane press 'Enable'.