Netbox Login failed after upgrade to version 2.9.0

NetBox released the version 2.9.0 where after the upgrade the login failed with a Server error due to a change in the Authentication backend.

After the upgrade my installation came up with the error screen shown below:

The message to check missing required packages and WSGI service not restarted after upgrade might be a bit misleading.

The cause is a change in the Authentication backend, which is addressed now in version 2.9.1.

Some additional information are in Issue #5033.

To fix this issue, the line with REMOTE_AUTH_BACKEND needs to be changed from utilities.auth_backends.RemoteUserBackend to netbox.authentication.RemoteUserBackend in the file configuration.py.

  # Replace this line
  #-->>REMOTE_AUTH_BACKEND = 'utilities.auth_backends.RemoteUserBackend'
  # With this line
  REMOTE_AUTH_BACKEND = 'netbox.authentication.RemoteUserBackend'