I have tried using the 2862 as a pass through router, and all works fine when I connect using the LAN address, but as soon as I set client IP to WAN address it fails with "The remote connection was not made because the attempted VPN tunnel failed The VPN server might be unreachable. If this connection is attempting to use an L2P/IPsec tunnel, the security parameters required for IPsec negotiation might not be configured properly." I have disabled all options in VPN remote access set up, and tried various protocols with correct port settings, I am obviously missing something can anyone advise?

(I was previously running my VPN through a Sky router, but changed ISP to PlusNet, and the hub they supply wont support it, and the Sky hub is now unable to connect to the internet)