seems like your DNS works fine but your certs doesn’t. Are you able to connect to your services on your browser normally, with SSL?
Edit: please also try curl -4
and curl -6
to your services from within the uptime kuma container to see if theres an ipv4/v6 issue
Another edit: seems like there is a dataprolet
URL in your post and a datenprolet
URL in your comments. It might just be a typo so also check that too.
Then I guess you only define an A record in the DuckDNS panel. That’s fine.
A while back I ran a somewhat similar Wireguard tunnel and can’t connect. Turns out some MTU settings were lower than the docker’s MTU and that breaks big packets like SSL handshakes. Restarting makes it work fine until things start congesting again.
Suffice to say this would be something I’ll look at if the SSL errors reoccurs