CentOS - Feb 2006 - Ports require to do yum update?

I have a couple CentOS boxes running in our DMZ and although they are
running behind a firewall, I'm also running iptables. One thing I cannot
do it yum update. What ports are required for this? I have outbound http
open and I can browse to sites using firefox. 

If I run an ethereal scan the process seems to stop with DNS queries,
but I can resolve mirrorlist.centos.org without a problem. Anyone know
what the problem could be?

If I stop iptables everything works of course.

Thanks,
James

On Wed, 2006-02-22 at 12:20 -0500, James Pifer wrote:
> I have a couple CentOS boxes running in our DMZ and although they are
> running behind a firewall, I'm also running iptables. One thing I
cannot
> do it yum update. What ports are required for this? I have outbound http
> open and I can browse to sites using firefox. 
> 
> If I run an ethereal scan the process seems to stop with DNS queries,
> but I can resolve mirrorlist.centos.org without a problem. Anyone know
> what the problem could be?
> 
> If I stop iptables everything works of course.
> 
I depends on the server, but either outbound to port 80 or outbound to
port 21 (for ftp).
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> I depends on the server, but either outbound to port 80 or outbound to
> port 21 (for ftp).
Turns out my repo file for CentOS was pointing to port 81. yum update
downloaded an updated yum conf for CentOS and no longer has the 81.

Weird. 

Thanks,
James