Mysub.noho.st unreachable / Could not update IP address to DynDNS

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Some further details:

  1. IPv6

Yuno’s diagnosis has always reported that this server does not have working IPv6 – I never bothered to follow that up since it didn’t seem to be a problem.

  1. regen-conf nameserver addresses

Something else I wonder about is that I’ve noticed that when I sudo yunohost tools regen-conf --with-diff --dry-run the diff shows that the same addresses will both be added and removed, e.g.

+nameserver 195.160.173.53
+nameserver 2001:910:800::40

but further down:

-nameserver 195.160.173.53

and

-nameserver 2001:910:800::40

If I actually run regen-conf, then reboot the server, then do the dry run again, I get another, similar diff.

  1. In case anyone was wondering, these two values cited in the diagnosis output in my last post are different in the unredacted version: