I met the problem when I connected to VPN with AT&T Network Client. I can see "Ethernet adapter AGN Virtual Network Adapter" was configured with correct IP/Subnet Mask/DNS, everything looks exactly the same as it worked. But I can not ping DNS servers at all. I called help desk, as usually they suggested to uninstall and remove and configuration directories, and had a reinstall after reboot my system. Also they talked about the correct configuration. That still does not work.
I noticed that when I can connect to VPN several days ago, when I just re-installed my Windows XP. (I re-installed just because I can not use VPN, T.T). I noticed the difference: I installed Sun xVM VirtualBox. vBox (short for Sun xVM VirtualBox) configured a new network connection, and installed VirtualBox Bridged Networking Driver. The driver was automatically added to AGN Virtual Network Adapter too, which is adapter for VPN. So the next step, I unchecked the VirtualBox Bridged Networking Driver in AGN Virtual Network Adapater properties page, and clicked ok to save. Then dialed VPN again. After connected, I now can ping DNS servers, and can access VPN network resouces. Oh yeah~
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