When the authentication of a user fails, MaxScale reloads the list of database users. This reloading is rate limited which causes the error message in question to be logged.
Inspecting the error logs of MaxScale for any clues about the failed authentication attempts will allow you to fix of the root cause of the problem.
The MaxScale tutorial over at the MariaDB KB shows How to set up MaxScale and how to configure database grants for use with MaxScale.
When the authentication of a user fails, MaxScale reloads the list of database users. This reloading is rate limited which causes the error message in question to be logged.
Inspecting the error logs of MaxScale for any clues about the failed authentication attempts will allow you to fix of the root cause of the problem.
The MaxScale tutorial over at the MariaDB KB shows How to set up MaxScale and how to configure database grants for use with MaxScale.