Why are these ports open in iptables on new FC4 install?

[J. K. Cliburn]

Scot L. Harris wrote:

> Looked through the release notes and did not see anything related to
> ports 5353, 50, 51, or 631.
> 
> Why is port 5353 open by default?  From searching around this appears to
> have something to do with multi cast DNS which seems to be tied to Apple
> iTunes.  I don't believe I installed anything that would need access to
> Apple iTunes.

mDNSResponder.  I removed the rule.

> 
> I also don't understand why ports 50 and 51 are open.  I don't plan on
> setting up a VPN at the moment and I don't know why these would be open
> by default on a new install.

Dunno why.  I removed the rules.

> 
> I'm also wondering about port 631 being open by default.  I know this is
> used for ipp printing but I have not setup this machine to provide print
> services yet.

This is the cups configuration web portal.  See http://127.0.0.1:631