Update:
Dachte, es kann evtl. am Apache Server liegen.
systemctl status apache2.service
Brachte folgendes:
root@UCS-Server:/# systemctl status apache2.service
● apache2.service - The Apache HTTP Server
Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Sun 2023-06-04 19:19:46 CEST; 15s ago
Docs: https://httpd.apache.org/docs/2.4/
Process: 4935 ExecStart=/usr/sbin/apachectl start (code=exited, status=1/FAILURE)
Jun 04 19:19:46 UCS-Server systemd[1]: Starting The Apache HTTP Server...
Jun 04 19:19:46 UCS-Server apachectl[4935]: AH00526: Syntax error on line 30 of /etc/apache2/sites-enabled/univention-letsencrypt.conf:
Jun 04 19:19:46 UCS-Server apachectl[4935]: SSLCertificateFile: file '/etc/univention/letsencrypt/signed_chain.crt' does not exist or is empty
Jun 04 19:19:46 UCS-Server apachectl[4935]: Action 'start' failed.
Jun 04 19:19:46 UCS-Server apachectl[4935]: The Apache error log may have more information.
Jun 04 19:19:46 UCS-Server systemd[1]: apache2.service: Control process exited, code=exited, status=1/FAILURE
Jun 04 19:19:46 UCS-Server systemd[1]: apache2.service: Failed with result 'exit-code'.
Jun 04 19:19:46 UCS-Server systemd[1]: Failed to start The Apache HTTP Server.
Also dachte ich, ich deinstalliere mal letsencrypt.
Endresultat, die Konsole startet mit:
Also letsencrypt erneut installiert:
Getestet mit IP und FQDN