Hi! I think i found a bug in the GRE47 (PPTP) nat.
If I connect a tunnel through zeroshell it works. If I then restart my computer without logging off the tunnel it is impossible to get the tunnel work again in other way then restart the zeroshell box.
What release of Zeroshell do you use?
On the console, with the command
check if the connection tracking NAT helper for pptp module (ip_nat_pptp) is loaded. Starting with the release 1.0.beta5 this module is automatically loaded at the startup.
If the module is not loaded you can load it with
Please, let me know if you solve or not the problem.