Xfinity stream app on Lg tv
I have the xfinity stream app installed on an LG 43lm57 which is supported per the docs. The LG firmware is upgraded to most recent version. When I use it the app hangs at the splash screen which says xfinity stream beta. The tv is connected to an wireless access point behind a 3rd party firewall which is connected to a xfinity approved third party modem. If I plug the tv into the modem, The app starts, I can register the app, and watch videos. I have looked at the access logs in the firewall and can find no traffic being denied by the firewall. Looking at the streaming app docs, it says a 3rd party modem is supported but makes no mention of support for intermediate network devices and/or the firewall ports required for it to work. Does anyone have any advice On troubleshooting steps to figure this out and getting it to work?