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Re: noob question - LT2P

Posted: Thu Mar 17, 2016 2:32 pm
by mark.barl
I have just been setting up L2TP with iPhone connectivity. The following may help.

L2TP uses 3 ports. UDP Port 500, UDP port 1701 & UDP port 4500. You will have to forward these 3 ports to your VPN server.
I found eventually, that the iphone has a problem if some non alphanumeric characters are used in the Shared Secret. It doesn't even attempt to go over the network. I changed mine to all alpa numeric (Mixture of upper and lower case is fine) then it worked a treat.

Hope this helps.