BIP8301
Severity
20 : ErrorMessage
Failed to send initial registration to the User Name Server.Explanation
The Broker communicates with the User Name Server in order to procure user and group information for configuring topic ACLs. This broker has never established communication with the User Name Server and has no cached user and group information. The process will be terminated.Response
Check that the User Name Server is running. Check preceding system log entries for related errors.