Now I've solved my disconnection after 30 seconds and my client is
connected to the remote network...
I can't reach any computer on the remote network!!!

Normally I can ping a computer or be connected by a web broswer or a
terminal server session... but nothing works!!!

I can see that the time to disconnect counter to be reinit if I try to

ping a remote computer, so my VPN client detect the trafic and reinitthe counter.

What can I do/test now?