Openvpn client web traffic setting problems

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http://askubuntu.com – I have setup an openvpn access server in my vps. And now l'm living China, the goverment blocks the many foreign sites such as facebook and twitter. I can use the vpn server the cross the firewall of China to access twitter and so on through my desktop running the windows xp. However, my laptop running xubuntu 12.04 cannot break through the national firewall. I can connnet the vpn server by the openvpn termial client in ubuntu by the command "sudo openvpn --config client.ovpn" As the desktop works okay, I think the setting of the vpn access server is okay. Is there any sepcial setting in ub (HowTos)