I've set up a small office with 4 peer to peer networked computers with one having all the shared data on it. XP Pro all round. It has an ADSL2 connection via a Belkin F5D5730au Modem and Linksys WRT310N Router.
I've set up a Windows VPN server on this main computer for the clients to access the shared files from home.
From my workshop using a laptop running XP Pro I can connect to the VPN in less than a second and can browse the folders, use remote desktop etc.
My setup is a cable broadband modem Motorola Surfboard SB5101i and Dlink DIR-615 router.
When I take exactly the same laptop over to the client's house and plug it into their Siemens Speedstream 4200 ADSL Modem (I've taken their router out of the equation) I can connect to the internet, the VPN connection connects to the ip address and hangs on Verifying User Name and Password.and then we get this:
Error 732: Your computer and the remote computer could not agree on PPP control protocols
When I first set up their VPN access it worked for about 3 days but now it gets the above error every time. Nothing I can think of changed.
I've run wireshark on my connection and their failed connection and compared the captures and the only difference is that on the successful connection we get:
Transmission Control Protocol, Src Port: aplx (1134), Dst Port: pptp (1723), Seq: 0, Len: 0
and on the unsuccessful connection we get:
Transmission Control Protocol, Src Port: ff-sm (1091), Dst Port: pptp (1723), Seq: 0, Len: 0
The unsuccessful connection holds up at the next stage which is Configuration request for the PPP LCP Protocol. It always is rejected.
I'm afraid I don't know what a ff-sm Port is. Could anyone suggest whether this is where it is going wrong and what I might be able to do to fix it?
Thanks very much,