Streaming from Jellyfin to Chromecast

[niels]

I'm not sure how it works with Kodi, but for other media servers they often use proxy everything through their cloud. Jellyfin doesn't have this, media is loaded directly from your server when you cast. For that network access Google uses their own nameservers (8.8.8.8) and require a secure connection (https) so your DNS should resolve properly with a valid certificate.