yum port number

I am not sure which port number yum rides on. This triggers me to conduct a netstat test while doing yum installing packages.

Great, it works on port 80. Users need not worry that they will not be able to update or install packages since all ISPs allow port 80 in the outgoing direction. The same applies to icq, instant messages over port 80 and there is no need to worrying about firewall blocking.