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Port Forwarding/client issues

Posted: Sun May 20, 2018 1:19 am
by securityman
i connected an android phone through l2tp client that comes with the phone from Verizon. i was unable to get the connection to allow some SIP information to pass to an application on the phone. I tried to put the server in the DMZ and still no luck. I added the open VPN client and config file to the phone and was able to get the app to communicate after doing so. i have 2 questions:

1. Do Verizon and or other providers block ports or protocols through the mobile VPN client that comes with most phones? ( I was not able to configure it since i don't have access to it)

2. is it normal that a gateway would be able to block protocols or ports in a VPN? ( i was under the impression once established on a port it could bypass firewall rules for ports or protocols since it is encrypted. The only way i could get it working was to put the VPN server in the DMZ for now.)