When upgrading from MaxScale 2.4.x or lower to 2.5.x or higher there is a new requirement for server=<server list>
to be added to the binlogrouter . If this is not included Maxscale gives an Access denied error:
ERROR 1045 (28000): Access denied for user...
It would be great to get a more informational error message, maybe something like "no servers defined for binlogrouter"
"The list of servers where the database users for authentication are loaded must be explicitly configured with the servers or targets parameter."