Hello guys,
I’ve recently purchased google home hub. When trying to display my home assistant dashboards through https://cast.home-assistant.io/ demo to the home hub i receive an error saying: “Unable to connect to the Home Assistant websocket API” .My homeassistant is externaly rechable with the help of duckdns and i can use it outside my network without any issues. Thank you for any upcoming replies 
Same issue here!
Tried several options mentioned in other topics like; blocking Google DNS servers in firewall, DNS hairpinning to internal IP.
But no luck so far…
Hope someone can provide the missing link to resolve this issue.
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Did you guys solve this in the end?
Any luck here?
Unfortunately no