Port forwarding with VPN installed on router
ASUS RT-AC87U standard firmware with PIA as OpenVPN client installed on the router. QNAP NAS with 2 Foscam C1 V2 IP cams. Port forward setup for incoming requests for port 443 (SSL port of the NAS) to LAN static IP of the NAS. Goal is to access the IP cams from outside my network, using the QNAP VMobile app (I am open to suggestions for other tools to use).
This all works fine, if PIA is not enabled. But as soon as I enable the PIA VPN on the router, I can't access my IP cams anymore. Just to be clear, I am accessing the IP cams through the NAS, not through the camera itself.
Can't figure out why this is happening, and how to solve it. The IP address given to my router by PIA is correctly reflected in the QNAP remote access service (myQNAPcloud) but somehow the myQNAPcloud does not work anymore if PIA is switched on.
Obviously UPnP is disabled on the router.
Any suggestion are very welcome. Thanks.