Known issue with resolving hosts with multiple PTR records?

[MacShane, Tracy]

> -----Original Message-----
> From: redhat-list-bounces at redhat.com 
> [mailto:redhat-list-bounces at redhat.com] On Behalf Of Chet Nichols III
> Sent: Wednesday, 25 June 2008 12:00 AM
> To: General Red Hat Linux discussion list
> Subject: Re: Known issue with resolving hosts with multiple 
> PTR records?
> 
> The RHEL4 (update 6) boxes I tested this one worked fine 
> without an issue.
> They truncated (as expected), and switched over to TCP. 
> There might be a nameserver or two in there 
> that isn't accepting TCP requests. The fact it seems to be 
> working for a bunch of people might prove that one otherwise, 
> but you never know. Would there happen to be any firewalls 
> that are blocking 53/TCP, either incoming or outgoing, from 
> certain subnets?
> 
> Good luck- thanks!
> 
> Chet
> 
> 

Ahah, that was it. For some reason the firewall was configured to block TCP/53, while it was permitting UDP/53. Most peculiar and now it's all fixed. Thanks very much!