I followed this tutorial to set up local domain names with SSL-certificates using DuckDNS: https://notthebe.ee/blog/easy-ssl-in-homelab-dns01/

I have three local domains for my Nginx Proxy Manager running on a VPS, for my self-hosted Nextcloud and my Proxmox-WebGUI both running on my local Homeserver. They follow the scheme service.dataprolet.duckdns.org.

Now I use Uptime-Kuma to monitor my services including the three domains and for some reason those three domains constantly time out after 48 seconds. I already set up the retries to 3, but to no avail.

I also use Pi-hole and Unbound and thought, that might be an issue, but testing my DNS using dig, mtr, traceroute, nslookup and host all returned normal values and no errors.

Does anybody have any idea what could cause this? I’m kind of clueless at this point. Thanks in advance!

  • rearviewEnglish
    4·
    4 hours ago
    • Is your uptime kuma server on the same machine as your other services?
    • Are you using docker/podman? If so can you try to curl your services’ domain from inside the container and see if they resolve?
    • Dataprolet@lemmy.dbzer0.comOPEnglish
      3·
      4 hours ago

      Yes, Uptime-Kuma is running on the same domain as the other services, except the Nginx-Proxy-Manager, which runs on a VPS which I access via WireGuard. And yes, I’m using Docker. I tried curl’ing one of the domains from the Uptime-Kuma container and got the folllowing error: curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to service.datenprolet.duckdns.org:443. So thanks, now I have an idea about what I should investigate.

      • schizo@forum.uncomfortable.businessEnglish
        1·
        44 minutes ago

        Are uptimekuma and whatever you’re trying to monitor on the same physical hardware, or is it all different kit?

        My first feeling is that you’ve got some DNS/routing configuration that’s causing issues if you’re leaving your local network and then going through two layers before coming back in, especially if you have split horizon DNS.