Log filled with [core] Warning: Login failed errors

My log is filled with the following error:
[core] Warning: Login failed: ‘Administrator’ (Remote IP: ‘00.00.00.000’) GET /ocs/v2.php/cloud/users/Administrator?format=json from 00.00.00.000 at

The IP address showing is the IP of the server that nextcloud is actually hosted on.
Next cloud is working fine.