Container mailserver-mda-1 fails to start: Timeout after 2m0s waiting on dependencies to become available

[cmonty14]

Hi,
I noticed that container mailserver-mda-1 fails to start.
The error message in container's logfile is:

2024/02/03 20:49:27 Waiting for: tcp://db:3306
2024/02/03 20:49:27 Waiting for: file:///media/tls/mailserver.crt
2024/02/03 20:49:27 Waiting for: file:///media/tls/mailserver.key
2024/02/03 20:49:27 Connected to tcp://db:3306
2024/02/03 20:51:27 Timeout after 2m0s waiting on dependencies to become available: [tcp://db:3306 file:///media/tls/mailserver.crt file:///media/tls/mailserver.key]

Port 3306 is pointing to running container mailserver-db-1. This is content of container's logfile:

2024-02-03 20:33:24 0 [Note] Plugin 'wsrep-provider' is disabled.
2024-02-03 20:33:24 0 [Note] Server socket created on IP: '0.0.0.0'.
2024-02-03 20:33:24 0 [Note] Server socket created on IP: '::'.
2024-02-03 20:33:24 0 [Note] mariadbd: Event Scheduler: Loaded 0 events
2024-02-03 20:33:24 0 [Note] mariadbd: ready for connections.
Version: '11.1.2-MariaDB-1:11.1.2+maria~ubu2204'  socket: '/run/mysqld/mysqld.sock'  port: 3306  mariadb.org binary distribution
2024-02-03 20:33:24 0 [Note] InnoDB: Buffer pool(s) load completed at 240203 20:33:24
2024-02-03 20:33:34 3 [Warning] Aborted connection 3 to db: 'unconnected' user: 'unauthenticated' host: '172.22.0.2' (This connection closed normally without authentication)
2024-02-03 20:33:34 4 [Warning] Aborted connection 4 to db: 'unconnected' user: 'unauthenticated' host: '172.22.0.5' (This connection closed normally without authentication)
[...]

Can you please advise how to fix this issue?

Imo there's an authentication issue with the database.

I found a very similar issue #175 with this solution:
Please check your database permissions, especially the permitted hosts.

What does this mean?

Please note: this is a test deployment in my homelab on VM running Arch Linux.