I've had the same PPP server down problem for about 12 days. I then found the same solution on a number of forums. I disconnected the livebox, then connected my old modem - I was using a bingatone o ...
I am waiting (and waiting) for a livebox to arrive and do forsee a problem.
I currently use a Netgear Modem Router with a IP 192.168.0.1 and connect without problem to the VPN with an IP 192.168.1.1. ...