I have a requirement to connect from an android phone to a windows box via a VPN.
The windows box sits behind a router on the LAN, the android phone is connected to the internet via a mobile network provider.
I have successfully setup a VPN using PPTP such that the phone can connect to the windows box, the phone is the client, windows box the server.
I specify the router IP address as the server address for the vpn on the android side, and set up port forwarding on 1723 to the LAN IP address of the windows box.
This works fine. Problem I have is that I need multiple phones to be able to connect to the windows box, each of them needs to open a vpn connection. Now it seems that this is not possible, certainly with my current router (a Zoom 4G N150 Portable Wi-Fi Router), only the 1st VPN connects successfully, all subsequent connections fail.
A bit of research has shown this isn't unexpected but I can't find a way round it.
Is there a work around to allow multiple connections?
Two options I thought of were
a) try and connect each VPN using a different protocol, i.e. 1st on PPTP, 2nd on L2TP etc. - I have had no luck with this approach
b) purchase a more capable router which allows multiple VPN connections - does anyone know of such a router that is available in the UK?
c) ditch the vpn approach and just create a server making the vpn requirement redundant. The only reason for me to use the VPN currently is to allow an android phone to connect to a windows box by making it look like it resides on the same LAN. If I had an actual server with its own IP address, I would connect direct with no need for a VPN.
hope that makes sense, any pointers gratefully received..