Are you running dhcpd w/dynamic DNS support enabled?  It sounds like your 
firewall is trying to update entries on the DNS tables on your name server.

~Deepak

On Jan 10 2001, at 11:54, Mike Starke was caught saying:
> Ever since I replaced my Linux firewall with OpenBSD I
> have begun receiveing these errors on my name server.
> 
> Jan 10 12:20:05 ns1 named[11699]: unapproved update from 
> [<my firewall ip>].12471 for <my_domain_name>.com
> 
> 
> I have checked resolv.conf on both machines, I have ensured
> I have reverse mapping for the FW, In short I feel I have
> checked everything. This error is getting written to syslog
> approx every 3-5 minutes.
> 
> Anyone want to throw me a bone?
>  
> Mike
> mgcon@getnet.com
> http://www.getnet.com/~mgcon
> Phoenix, AZ
> USA
> 
> 
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-- 
Deepak Saxena - deepak@csociety.purdue.edu

Imagination is more important than knowledge - Albert Einstein