Hi, i implemented VPN on my OS X Server under Mountain Lion but when I try to connect I get always the message that the server is not responding.
I enabled portforwarding for UDP 1701, TCP 1723, UDP 500 and 4500 on the router which has NAT enabled and Support for IPSec passthrough set.
I tried with the internal IP Address which works perfect but still no success with external access.
I read about ip protocol 50, ESP but I didn't find out how to enable this one.
Any help in solving this problem is appreciated
A question of your router/firewall not a question of your Mac Server. You need to forward incoming ip/esp protocol (number 50) traffic to your MacServer if you want to use IPSec for your VPN. Mostly this is not possible with home and small business router boxes. Sometimes they have an option called "Exposed Host" or "DMZ Host" which means all of the incoming trafic, which does not fit to the NAT table, is sent to this host inside. An option which will work for your IPSec ESP protocol as well, but be careful! With this option you will really expose your host. You need to have a firewall in place to limit the access to services you like to use.