Unable to connect through Arris SGB6580 cable modem/router

SamSpade

Recently replaced my cable modem/router with a Arris SGB6580 and the VPN has been unable to connect since. Internet connection is working fine. Attempting with WIFI on an Android phone with the PIA app and hard line to a Windows 10 machine with the desktop PIA app. With the phone, as soon as I turn off WIFI (or get out of range) the VPN will connect successfully so the modem/router I'm assuming is blocking something necessary to establish connection. I do have Ipsec and PPTP passthrough enabled on the router.
Connection appears to hang on "waiting for server reply".

Omnibus_IV

Probably not the problem, but it is worth taking a look to see if VPN Passthrough is configured/on/working/?

http://arris.force.com/consumers/articles/General_FAQs/SBG6580-VPN-Passthrough-Setup/?l=en_US&fs=RelatedArticle

SamSpade

Update: I have been able to connect the VPN after changing the PIA app to use remote port 53 instead of auto--looks to be the only remote port option not blocked by the router firewall. Documenting this in case someone else runs into the issue. I haven't yet figured out how to manually add "allowed services" on this router though. Firewall lists all the allowed services but no editing function.