Dynamic DNS fails

Volker Wysk post at volker-wysk.de
Thu Mar 18 13:52:27 UTC 2021


Hi!

I've got a free dynamic DNS service (dyn-dns.com) set up and working, which
now fails since two hours ago. My host name can't be resolved:

   desktop ~ % LANG=C ping MYHOSTNAME
   ping: vwysk.now-dns.net: Temporary failure in name resolution

In /var/log/syslog, I get this:

   Mar 18 14:44:53 desktop systemd-resolved[1036]: Server returned error
   NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying 
   transaction with reduced feature level UDP.

"dig MYHOSTNAME" says this:

   ; <<>> DiG 9.16.1-Ubuntu <<>> vwysk.now-dns.net
   ;; global options: +cmd
   ;; Got answer:
   ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 50225
   ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

   ;; OPT PSEUDOSECTION:
   ; EDNS: version: 0, flags:; udp: 65494
   ;; QUESTION SECTION:
   ;vwysk.now-dns.net.             IN      A

   ;; Query time: 260 msec
   ;; SERVER: 127.0.0.53#53(127.0.0.53)
   ;; WHEN: Do Mär 18 14:48:06 CET 2021
   ;; MSG SIZE  rcvd: 46

To me this looks like Dyn-DNS's name server is down. Is this correct?

Thanks,
Volker
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