[ubuntu] Thinkpad t410, ubuntu 10.04.01, can not access network

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http://ubuntuforums.org – Thinkpad t410, ubuntu 10.04.01 64 bit, can not access internet suddenly by wireless router(Netgear WGR612) today. I can get ip address from rounter, and can ping, but can not access, telnet 80 showed me connection refused error, the weired thing is my another windows xp laptop can access internet through the same wireless router. Andbody can help me? Thanks a lot. (HowTos)