Help, Some site doesn't show up

We have a network of computer and has a DSL link for internet use. We haveproblem accessing some sites like mail.yahoo.com, launch.yahoo.com, www.friendster.com. the internet explorer will just stop at the 5th bar when loading the site. there is firewall installed and the cookies are enabled. can you help us

 

What kind of firewall are you using? There very well could be something other than cookies blocking access. If you turn off your firewall, can you access the sites? If your firewall has privacy settings, I'd look there.