2G can see website but in 3G can NOT access any internet,help!

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http://forum.xda-developers.com – this is driving me nuts now ... everything was working fine, then i flashed a new ROM , for the first few minutes it works fine , and then it can't connect to any internet server while in status bar shows H icons (HSDPA connection) and also in system information it shows data connected. first i thought it could be problem of my operator because such thing has happened before, so i went for sleep and the day next, still same, but i was able to use any internet applications with 2G connection (EDGE) , but not good with HSDPA. then i asked some friends who uses same operator but they (HowTos)