No dependent registrar found. No dependent registrar found for web services pool %1. Registrars are used to retrieve information ...

No dependent registrar found.

No dependent registrar found for web services pool %1. Registrars are used to retrieve information related to authenticated users, and without them authorization of users will fail when web services are accessed.
Cause: This can happen when the topology has been incorrectly configured with a web services pool without any registrar dependency.
Resolution:
Ensure that there is at least one registrar which depend on the web services.