I have a simular problem, port 80 and 443 are blocked so that our students
can not go around the proxy server (our required by law internet filter).
While I allow all these URL's on the proxy, some parts of windows update
utility do not go through the proxy in the system settings, and I see traffic
get stopped at the firewall.

Same issue, the firewall uses IP addresses not URL's. I too will try
pinging the url's and hopefully Microsoft does not change the addresses on us.

Thanks,
Chris

"Torgeir Bakken (MVP)" wrote:

> Richard Huelbig wrote:
>
> > To constrain web browsing on several PCs I've blocked all HTTP and HTTPS
> > traffic using my router. However, I want Windows Update to work on those same
> > PCs. Some of the PCs are running Windows 2000, some Windows 2003, and some
> > Windows XP. Which IP addresses (or URLs) should I ALLOW in my router tables
> > so that I don't prevent Windows Update from working?
> Hi,
>
> Open for TCP and UDP on ports 80 (HTTP) and 443 (HTTPS) for the
> following sites:
>
> *.download.microsoft.com
> *.windowsupdate.com
> *.windowsupdate.microsoft.com
> windowsupdate.microsoft.com
>
>
>
> --
> torgeir, Microsoft MVP Scripting, Porsgrunn Norway
> Administration scripting examples and an ONLINE version of
> the 1328 page Scripting Guide:
> http://www.microsoft.com/technet/scr...r/default.mspx
>