Host unknown: host not found...

[Mohammed Ghanawi]

When this problem happen can you resolve external names (www.sun.com), can you
resolve internal names (host.yourdomain.com), using nslookup. Try pingging
internal and external names.

Regards...

Darron Froese wrote:

> I'm having a bit of a problem here folks and was wondering if anyone could
> help.
>
> I've got:
>
> 2 x Linux 2.0.36 MkLinux Boxes running as Primary and Secondary Name Servers
> 1 x Linux 2.2.7 YellowDog Linux mailhost.
>
> Because of a ssh/RSAREF advisory I removed ssh and updated my yellowdog box
> to OpenSSH (that required a glibc update as well - I used some RPM's from
> yellowdog to do that).
>
> The same say (Saturday) I updated my 2 name servers to Bind 8.2.2p5 (from
> Bind 8.2.1 - because of another advisory) everything seemed to work just
> fine (everything was and is resolving) until Monday when I started getting
> errors in the syslog:
>
> Dec 20 13:09:00 mulder sendmail[19162]: NAA19160:
> to=<Iharder at slyngshot.com>, delay=00:00:09, xdelay=00:00:00, mailer=esmtp,
> relay=mail.briercrest.ca., stat=Host unknown (Name server:
> mail.briercrest.ca.: host not found)
> Dec 20 13:09:00 mulder sendmail[19162]: NAA19160: NAA19162: DSN: Host
> unknown (Name server: mail.briercrest.ca.: host not found)
>
> I also got a couple of these in my mailbox:
>
> The original message was received at Wed, 22 Dec 1999 15:13:54 -0700
> from localhost
>
>    ----- The following addresses had permanent fatal errors -----
> <cmb-newswire-return-92-bookings=slyngshot.com at returns.egroups.com>
>
>    ----- Transcript of session follows -----
> 550 <cmb-newswire-return-92-bookings=slyngshot.com at returns.egroups.com>...
> Host unknown (Name server: mx1.egroups.com.: host not found)
>
> Return-Path: <MAILER-DAEMON>
> Received: from localhost (localhost)
>     by mulder.fudgehead.com (8.9.3/8.9.3) with internal id PAA24237;
>     Wed, 22 Dec 1999 15:13:54 -0700
> Date: Wed, 22 Dec 1999 15:13:54 -0700
> From: Mail Delivery Subsystem <MAILER-DAEMON>
> Message-Id: <199912222213.PAA24237 at mulder.fudgehead.com>
> To: <cmb-newswire-return-92-bookings=slyngshot.com at returns.egroups.com>
> MIME-Version: 1.0
> Content-Type: multipart/report; report-type=delivery-status;
>     boundary="PAA24237.945900834/mulder.fudgehead.com"
> Subject: Returned mail: Host unknown (Name server: mail.briercrest.ca.: host
> not found)
> Auto-Submitted: auto-generated (failure)
>
> On Tuesday there wasn't a *single* failure while today a few more appeared.
> I can *always* manually resolve those addresses and there are no named
> errors to be found in the bind logs or the syslog.
>
> This is only happening for a couple of the virtualhosts (at least that's all
> I've gotten so far) that we have on the mailhost and it is driving me batty.
>
> I've searched at Altavista, Deja.com, and the newsgroups looked through my
> O'Reilly Sendmail and Bind books to no avail - I've got no idea what's going
> on. Does anyone have any ideas? Got a bone to throw?
>
> Thanks for *any* help at all.
> --
> Darron
> darron at fudgehead.com


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