I REALLY need help with tunnelling through a firewall.
The setup is as follows:
I have a server within the company lan. Outside in the big ugly real world i have some clients. Now, i need to establish and maintain a VPN (PPTP protocol) from the server to each client. The server knows the IP address of each client.
This connection might pass through a proxy and might pass through a firewall. However i do not want to make any "holes" through these devices. Can this be done. Perhaps by tunelling through port 80.