DSL internet connection sharing problem.

I am running Windows 2000 Professional with SP1 installed.
Internet sharing over a DSL connection works good except some Web sites
will not come through to the client PC’s… The server can view them…
and they can be pinged from the clients.
Both Netscape and IE will not view the sites… the browser will say…
“site contacted waiting for reply”… and just sit there. This is a
tough one….. the two major sites that have given this problem are
kodak.com and compaq.com, I am sure there are more. I am at a loss
right now…. everything else works great… ICQ…. AIM…