It's an expired intermediate certificate in the chain of the device certificate....

		OhMeadhbh 5 months ago \| parent \| context \| favorite \| on: Ask HN: What is going on with Google Chromecast? It's an expired intermediate certificate in the chain of the device certificate. https://old.reddit.com/r/Chromecast/comments/1j7lhrs/the_chr... and https://www.theregister.com/2025/03/10/google_chromecast_out...