HTTP Error 500 - System.Security.SecurityException: The username or password is incorrect.

Question / Problem

HTTP Error 500 - System.Security.SecurityException: The username or password is incorrect.

Answer / Solution

The logged in user has no read permission to query his groups from the Active Directory. The group 'Authenticated Users' has no read permission. Grant read permission to the group 'Authenticated Users' of the affected user:

1. Open Admin.msc.
2. Go to the Active Directory.
3. Search for the affected user and open his properties.
4. In the tab 'Security' select the group 'Authenticated Users'.
5. Enable the checkbox 'Read' and press 'Apply'.