Pihole installation just vanished!

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Expected Behaviour:

i had pihole running for months now, did the last update some weeks ago. Yesterday it still worked

Actual Behaviour:

but today the whole installation just vanished:

There is no web gui, no ssh - nothing - even the IP-Address is not existing any more….
When I do connect the Pi via HDMI it shows the raspian screen and lets me work.
the IP Address it the one of pihole, but I cannot reach the device though ssh is set to active

Debug Token:

drIDE182

The debug log shows Pi-hole is running and its IP is: 192.168.1.253.

The web server is also running and using ports 80 and 443:

 2026-01-28 23:31:42.239 CET [2160M] INFO: Web server ports:
 2026-01-28 23:31:42.239 CET [2160M] INFO:   - 0.0.0.0:80 (HTTP, IPv4, optional, OK)
 2026-01-28 23:31:42.239 CET [2160M] INFO:   - 0.0.0.0:443 (HTTPS, IPv4, optional, OK)
 2026-01-28 23:31:42.239 CET [2160M] INFO:   - [::]:80 (HTTP, IPv6, optional, OK)
 2026-01-28 23:31:42.239 CET [2160M] INFO:   - [::]:443 (HTTPS, IPv6, optional, OK)

Also, the log shows ssh service is running on port 22:

*** [ DIAGNOSING ]: Ports in use
(...)
    tcp:0.0.0.0:22 is in use by sshd
(...)
    tcp:[::]:22 is in use by sshd

Maybe this is a network / firewall problem.