my.cloudron.tld is not accessible (mysql down but apps are online)

[hpz24]

Description

The dashboard has recently become inaccessible, but all apps (e. g. NodeBB) works without problems.

Steps to reproduce

Several reboots, no changes in the behaviour

Logs

2025-12-01T08:45:37.296Z box:server ==========================================
2025-12-01T08:45:37.296Z box:server            Cloudron 8.3.2
2025-12-01T08:45:37.296Z box:server ==========================================
2025-12-01T08:45:37.296Z box:platform initialize: start platform
2025-12-01T08:45:37.329Z box:tasks stopAllTasks: stopping all tasks
2025-12-01T08:45:37.332Z box:shell tasks /usr/bin/sudo -S /home/yellowtent/box/src/scripts/stoptask.sh all
2025-12-01T08:45:37.396Z box:shell All tasks stopped

2025-12-01T08:45:37.409Z Error: Error starting server: {"name":"BoxError","reason":"Database Error","details":{},"message":"connect ECONNREFUSED 127.0.0.1:3306","nestedError":{"errno":-111,"code":"ECONNREFUSED","syscall":"connect","address":"127.0.0.1","port":3306,"fatal":true},"code":"ECONNREFUSED","sqlMessage":null}
2025-12-01T08:45:37.409Z     at main (/home/yellowtent/box/box.js:58:41)
2025-12-01T08:45:37.409Z     at process.processTicksAndRejections (node:internal/process/task_queues:95:5)

Output from systemctl status mysql.service:

root@server:~# systemctl status mysql.service
× mysql.service - MySQL Community Server
     Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
     Active: failed (Result: exit-code) since Mon 2025-12-01 08:48:56 UTC; 2min 57s ago
    Process: 14245 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
    Process: 14253 ExecStart=/usr/sbin/mysqld (code=exited, status=2)
   Main PID: 14253 (code=exited, status=2)
     Status: "Server startup in progress"
        CPU: 876ms

Dez 01 08:48:56 v220230337933223533 systemd[1]: Failed to start MySQL Community Server.
Dez 01 08:48:56 v220230337933223533 systemd[1]: mysql.service: Scheduled restart job, restart counter is at 5.
Dez 01 08:48:56 v220230337933223533 systemd[1]: Stopped MySQL Community Server.
Dez 01 08:48:56 v220230337933223533 systemd[1]: mysql.service: Start request repeated too quickly.
Dez 01 08:48:56 v220230337933223533 systemd[1]: mysql.service: Failed with result 'exit-code'.
Dez 01 08:48:56 v220230337933223533 systemd[1]: Failed to start MySQL Community Server.

Troubleshooting Already Performed

Reboot done, same again

System Details

Cloudron Version

Cloudron 8.3.2

Ubuntu Version

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 22.04.2 LTS
Release:	22.04
Codename:	jammy

Cloudron installation method

• Manual with ./cloudron-setup

Output of cloudron-support --troubleshoot

Vendor: netcup Product: KVM Server
Linux: 5.15.0-161-generic
Ubuntu: jammy 22.04
Processor: QEMU Virtual CPU version 2.5+ x 2
RAM: 2010712KB
Disk: /dev/vda3        19G
[OK]	node version is correct
[OK]	IPv6 is enabled and public IPv6 address is working
[OK]	docker is running
[OK]	docker version is correct
	MySQL is down. Trying to restart MySQL ...
Job for mysql.service failed because the control process exited with error code.
See "systemctl status mysql.service" and "journalctl -xeu mysql.service" for details.

Thank you for any hints!