You solve that by complaining to the operators of the servers that their DNS servers mis-implement DNS COOKIE (RFC 7873) and could they request a fix from their DNS vendor.
Not that they make things easy to contact them. No email in whois. Just a PO box and a phone number and I don’t intend to call it from here. name...............: DATATOWER AB register number....: 0708753-2 address............: PB 144 address............: 67101 address............: KOKKOLA country............: Finland phone..............: +358 20 7789 564 holder email.......: https://datatower.fi is just a login form with a bad CERT (for mail.datatower.fi). Mark > On 11 Jun 2019, at 4:36 am, Jukka Pakkanen <jukka.pakka...@qnet.fi> wrote: > > Yeah, another advertising company turned to an ISP... > > Solved *our* problem now by including the suggested server clause for both of > their broken servers, to our servers. Of course does not solve the real > problem, the broken servers of theirs. > > Thanks for help. > > Jukka > > -----Original Message----- > From: Stephane Bortzmeyer <bortzme...@nic.fr> > Sent: 10. kesäkuuta 2019 20:01 > To: Jukka Pakkanen <jukka.pakka...@qnet.fi> > Cc: c...@cam.ac.uk; bind-us...@isc.org > Subject: Re: Strange DNS problem > > On Mon, Jun 10, 2019 at 05:43:02PM +0000, Jukka Pakkanen > <jukka.pakka...@qnet.fi> wrote a message of 58 lines which said: > >> Then, unfortunately our nameservers won't resolve ns.kpk.fi either. > > Same authoritative name server, same problem. See my email. > > % dig @ns.datatower.fi. NS kpk.fi. > > ;; Warning: Client COOKIE mismatch > > _______________________________________________ > Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe > from this list > > bind-users mailing list > bind-users@lists.isc.org > https://lists.isc.org/mailman/listinfo/bind-users -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users