DNS MX timeouts

[ic.nssip]

I had the same problem yesterday with two servers running BIND 9.5.0-P2 on 
SPARC Solaris 8.

I had to kill the process few times and finally it worked.
After a time it failed again to resolve MX records for the same users.

I updated the root zone (it had some old records) and it never failed again 
from yesterday.

I cold not find any explanation as I had other DNS server on the same 
network running the same configuration and which never failed.

Did somebody else had the same problem?

Best Regards,
Julian

NT, Canada



----- Original Message ----- 
From: "Vernon A. Fort" <vfort at provident-solutions.com>
To: <bind-users at isc.org>
Sent: Friday, June 26, 2009 1:40 PM
Subject: DNS MX timeouts


> I've run into a problem with named and timeouts primarily with MX lookups. 
> When a MX query fails the first time, i have to restart the named process 
> before it will return a successful query.  Again, its mainly with MX 
> lookups but it also happens with A records as well.  The problem subsides 
> for 1-2 hours and starts happening again - basically i look in the mailq 
> for deferred messages with MX lookup failures.
>
> This box is a Gentoo install running a medium volume (500K per day) mail 
> server - lots of dns queries due to rbl's, spamassassin, etc.  This 
> problem started showing up around mid-may.  Since then, i have 
> re-installed bind and bind-tools several times, updated the kernel, linux 
> headers to 2.6.29, recompiled glibc, etc....
>
> I just updated to 9.6.0-P1 from 9.4.3-P2 - same problem exists.  When 
> doing a manual MX lookup (dig MX isc.org) - it takes around 45 seconds on 
> the first attempt.  If it fails the first time, it will never return a 
> positive query, just "connection timed out; no servers could be reached" 
> until i restart named.  I can't say for sure but the bind application was 
> updated around the time i noticed this problem.  All versions of bind i 
> have tried (in gentoo portage) have the same problem.
>
> Can anyone help me find where this problem might be?  I've google'd until 
> my eyes are red and throbbing.
>
> Thanks
>
> Vernon
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