I have a couple servers with Debian 12, running MariaDB. The servers were configured with bind-address 127.0.0.1:3306 so that any database connections are local.I upgraded to Debian 12.15 today, rebooted and checked open ports just to see if all services are running.To my surprise, MariaDB is no longer listening on 127.0.0.1:3306, but we have init listening to :::3306.It looks like default config has changed to use Systemd sockets. Which I guess is fine, but silently making your database server accessible to the whole Internet doesn t sound like a good idea.So, just PSA, if you rely on bind-address only, make sure you reconfigure the mariadb.socket sockets.