It seems that rebooting unraid with this serve configuration completely breaks unraid webui. I had to ssh in to tailscale serve reset. Altough it broke unraid webui the nextcloud instance was running ok and even collabora was ok. This was the error i got when I ssh'd in :
Message from syslogd@Odin at Feb 23 15:11:21 ...
nginx: 2025/02/23 15:11:19 [emerg] 50050#50050: bind() to 100.121.160.123:443 failed (98: Address already in use)