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Error trying L2TP IPSEC from windows 7 to Zywall USG 100

Hello I'm trying to connect from my Windows 7 to a Zywall USG 100, I think I do everything rigth, when I try to open the VPN I get the error :

Error 788 The L2TP connection attempt,  because the security level could not negotiate compatible parameters with the remote computer.

How can I know where is the error?

Thanks
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marek1712
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ASKER

First I want to thank you for you rinterest.

I can post the Zywall configuration but If you havem't experience with this firewall It will be confused for you.

I'm using as clent a Windows 7 And I think the problem is the negotation between Zywall and Windows 7.

The general parameters in the Zywall is:
L2TP_VPN IPSEC with pre-shrared key
User and password to open the tunnel.

If you want I'll sent the zywall configuration
Thanks