I am using ExpressVPN as my provider.
If I disable the VPN local NF works, if I direct all chromecast and phone traffic through the VPN NF also works but then I am unable to use other local streaming services and other location aware sites and services are a bit of a pain, I can live with it but...
I am trying to route netflix traffic over vpn1 and have run into a snag with a chromecast. The routing works using the netflix app on my android phone but when I try to cast to the chromecast I get the dreaded proxy error.
I believe the problem lies within the hard coded DNS on the chromecasts...