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My home Internet provider uses L2TP. So does my office network. And I want to connect from home to office.

But after connecting to internet I cannot connect to my office network in Windows XP. I installed the certificate [it is correctly installed] and tried all the ways to configure it in Windows XP: using certificate or using CHAP v 2. It either gives 678 or 800 error. And for sure, the office VPN is up. They provided us with an instruction on how to configure settings for Windows 7, and there you can provide both certificate and CHAP protocol to use, and put your domain-name/password from office network, while in XP you cannot provide both. So the connection cannot be established.

So I guess is there a tool for Windows XP for establishing VPN connection through existing internet connection other than native one?

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How are you connecting to the internet ? –  onxx Apr 21 '12 at 6:20
    
@onxx VPN (L2TP) –  EugeneP Apr 21 '12 at 8:06
    
That's the connection you are making after you are connected. Are you using cable/adsl, how are you connecting to that wired or wifi? –  onxx Apr 30 '12 at 15:12
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