[ubuntu] Some Web Sites only opens via proxy.......WHY ????

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http://ubuntuforums.org – Hi, my problem is that some web sites for example the "youtube-dl" downloading site "http://bitbucket.org/rg3/youtube-dl/wiki/Home" only opens when browsed via a proxy. I used http://www.wattproxy.info/. I use the following (3) DNS servers,, my ISP's DNS. Not only http://bitbucket.org/rg3/youtube-dl/wiki/Home, a few other web sites, are also not responding. I tried 3 browsers (a) Firefox, (b)Opera, (c) Google Chrome. None were able to open http://bitbucket.org/rg3/youtube-dl/ I am quite sure that my ISP is not blocking any pages. Please help. (HowTos)