Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server

https://stackoverflow.com/questions/1559955/host-xxx-xx-xxx-xxx-is-not-allowed-to-connect-to-this-mysql-server

https://mariadb.com/kb/en/mariadb/configuring-mariadb-for-remote-client-access/

https://stackoverflow.com/questions/43124641/not-allowed-to-connect-to-this-mariadb-server-in-php

You need to configure the users (in our case the root user) as following: