online update through Sonicwall firewall

Hi all

I am a new user testing suse linux as a replacement for win XP at my company
we have a Sonicwall firewall, i have already allowed download.opensuse.org through the filewall but i still get
the error message "permission to access http://download.opensuse.org/update/12.3/repodata/ect ect / denied
any ideas on what address or port# i'm missing

thanks
dan jarvis