[ubuntu] cant find server error

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http://ubuntuforums.org – Hello all, I have been having a lot of problems with connections lately. Everything will be working fine for awhile, and then when Itry to go to another website a window will open and tell me it cant find server,with an option to try again. Sometimes I can click try again 2 or 3 and it will finally load the page, sometimes it wont.I have new DSL netgear 7550 modem AT&T shipped to me.I am also using the Noscript addon and Ghostery so knowing 0 about networking, Idont even know where to start trouble shooting this problem. If anyone could give advice on where to start or what info to provide (Hardware)