IPSec / L2TP ports.

Hello,

I was working with my firewalls on my dedicated servers and I am unable to create connections from iOS or any other device EXCEPT windows by using IPSec / L2TP.

I opened up port 500, 4500 and 1701 on UDP to allow connections and everything works perfect on windows, as for Mac OS and/or other platforms it will not initiate a connection. Am I missing out on something here?

I use SoftetherVPN on Debian 8, with all options ticked in the IPSec settings. I use private key which I have verified is correct. The error seems to be connecting to the actual server. I block all UDP ports except the formentioned one which is why I’m asking.

What am I missing out on?

Thanks, Jam