IPhone can't connect to L2PT VPN

I am running Mac OS X Server (10.9.3) on a Mac Mini providing a L2PT VPN. The VPN works fine on my MBP but neither my iPhone (7.1.1) or iPad (7.0.6) can connect. I keep getting this error "The L2PT-VPN server did not respond. Try reconnecting. If the problem continues, verify your settings and contact your Administrator."

I've updated to 7.0.4 already but it can't connect VPN also.
Are there anyone come to play with this issue?
Please.

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