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Marc, your information is a bit scant, there are many ways to establish VPN, what client are you using, what is used for the VPN server etc.
If you're using a windows VPN client and you have another machine my suggestion would be to see if you can establish the VPN on the other machine.
Are other VPN clients similarly affected; if the VPN server is a router based then it may be that the router just needs a reboot.
If your VPN is set up between 2 routers check that both have the correct static IP's if you can look at the logs and see if you can get an idea as to what is happening.
You used the term modem, is your setup using a modem/router in bridging mode? If so can you browse the web normally before attempting the VPN connection.?
It may also be that there is a routing issue within the wan and the VPN can't establish because of that.
Last edited by acropolite; 09-08-2012 at 08:11 PM.
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