[ubuntu] Can't see certain web pages in Ubuntu 10.04

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http://ubuntuforums.org – Hi folks, I'm using a wired DSL broadband connection on ubuntu 10.04,the problem is i am unable to see certain web pages in my firefox and chrome as well... some web pages aren't loading at all.. but these webpages loads in windows..! what's this problem because of?? any solutions?? eg of pages not loading http://sourceforge.net/ http://shaastraiq.heroku.com ,http://speedtest.net and some other pages...!! any fix available??? (HowTos)