Cant' Access VPN on iPhone

Hi all,

having a really odd problem since my upgrade to the latest release.... When I connect my iphone to my wireless RT-N66u, it cannot connect to any VPN services, using either the PIA app or the openvpn app... However as soon as I go to LTE, it works fine... So something on my router settings is blocking my ability to access the VPN on wireless...

However it works fine on my PC?!!? Super odd - PC attached to the same router can run the PIA app and connect no problem....

Any thoughts?