ERROR: Challenge is invalid!

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OK fine. But this is what shows in certificate transparency reports.

Now I am certainly not the sharpest tool in this box, but as far as I can tell from redacted information is that the last cert was issued for syno...
2020-11-15 2020-11-15 2021-02-13 synouru.diskstation.eu synouru.diskstation.eu was a long, long time ago.

What are you trying to achieve here? If you are really trying to get certificates I would suggest being a bit more open and transparent with your needs.

LetsDebug says there are serious issues to be resolved.

So something is amiss here.

synouru.diskstation.eu
synouru.diskstation.eu499×534 23.9 KB

My analysis reveals nefarious information:

rip@T430:~$ nslookup diskstation.eu
;; connection timed out; no servers could be reached

rip@T430:~$ nslookup synouru.diskstation.eu
;; connection timed out; no servers could be reached

rip@T430:~$ ping synouru.diskstation.eu
ping: synouru.diskstation.eu: Temporary failure in name resolution

rip@T430:~$ nmap synouru.diskstation.eu
Starting Nmap 7.92 ( https://nmap.org ) at 2022-11-15 19:12 PST
Failed to resolve "synouru.diskstation.eu".
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 20.06 seconds

rip@T430:~$ nmap diskstation.eu
Starting Nmap 7.92 ( https://nmap.org ) at 2022-11-15 19:13 PST
Failed to resolve "diskstation.eu".
WARNING: No targets were specified, so 0 hosts scanned.
Nmap done: 0 IP addresses (0 hosts up) scanned in 22.06 seconds

rip@T430:~$ whois synouru.diskstation.eu/
No whois server is known for this kind of object.
rip@T430:~$ whois diskstation.eu
%
% WHOIS diskstation.eu
Domain: diskstation.eu
Script: LATIN

Registrant:
        NOT DISCLOSED!
        Visit www.eurid.eu for webbased WHOIS.

On-site(s):
        NOT DISCLOSED!
        Visit www.eurid.eu for webbased WHOIS.

Registrar:
        Name: Key-Systems GmbH
        Website: www.key-systems.net

Name servers:
        ns2.crns.de
        h2-045.net.crns.de

Please visit www.eurid.eu for more info.

So it may be possible there are other issues involved here. Blocking by country... Obfuscating by intent... Firewall? DNS seems to be the root of the issue here.
If the world cant get to your site, why would you expect to achieve a successful certificate?
Are you the actual owner of this domain? Please respond.

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