Conncetion VPN works not-Tecra A8 / WXP

Hello

I have a Toshiba Tecra A8 (3 years) with Windows XP / SP3.
Everything works fine (network cable or wireless; Bluetooth too), with when I tried to configure a VPN connection to my company's server, it does not work.

The router in my house works well, as well the firewall in the work of the company.
I know that because the other Win XP or Win 7 PC and laptop can connect to the company.
I got the Error Message "721" (from component VPN) which could also be a network adapter error (unsupported protocol or if)- but there might be another reason too.

I tried to update the network adapter driver, but did not find a more recent software.
And currently, I am unwilling to upgrade to Windows 7 without knowing it, the error seems too.

Any ideas? Advice and links to possible answers, I would like to say thank you in advance.
Concerning
Peter

Don't know if this problem of card s really a LAN as described above; the network administrator must check everything first and determine if this problem of client for s (VPN) software.

Tags: Toshiba

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    Found.

    I had disabled PFS. I enabled PFS and the problem disappeared.

    http://en.Wikipedia.org/wiki/Perfect_forward_secrecy

    See sections 8-10 http://www.ietf.org/rfc/rfc2409.txt to see why

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