Creating certificate refused

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@jsha Hi. Thanks for your reply.

It’s strange because

  1. this configuration with exactly the same HW and port forwardings
    — using the DynDNS yyy.goip.de is o.k,
    — but not with DynDNS xxx.goip.de.
    (In addition I set up a different DynDNS zzz.goip.de and used the same router/Hw configuration . This also failed to setting up letsencrypt.)

2 using a different router also fails using the DynDNS xxx.goip.de, BUT a setup on this configuration with a QNAP server, Nextcloud and letsencrypt using DynDNS xxx.goip is working.

And yes, I can ping xxx.goip.de in the net and yes, I checked port forwarding 443 and 80 for the relevant device.

So I’m completely lost.