We have a windows 2003 server, Linksys (Cisco) WRT54G2 router. Two people can establish a vpn connection no problem, 4 people cannot. They get the ol' Error 721: the remote computer did not respond. for further assistance... (blah blah blah).
I've looked and looked for a solution, but not found one. Most focus on letting GRE 47 through or forwarding ports. Obviously, since it is working for two, it is not the router/server configuration (or is it?). All clients have their dial-in access enabled on the server.
I don't think it's the ISP; in fact two are involved and neither block VPN.
What I'm wondering is if there are settings on the client machine that I should be looking at?
Or, any recommendations for troubleshooting would be very much appreciated.
thanks in advance,