Strange DNS problem

[Mark Andrews]

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.pakkanen at 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 <bortzmeyer at nic.fr> 
> Sent: 10. kesäkuuta 2019 20:01
> To: Jukka Pakkanen <jukka.pakkanen at qnet.fi>
> Cc: cet1 at cam.ac.uk; bind-users at isc.org
> Subject: Re: Strange DNS problem
> 
> On Mon, Jun 10, 2019 at 05:43:02PM +0000,  Jukka Pakkanen <jukka.pakkanen at 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
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org