The Chromecast 2's device authentication certificate expired (march 9th 2025)
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The Google Chromecast 2's device authentication certificate expired on March 9th/10th 2025, preventing use of all devices via any method. Workarounds are known already, but no word yet from Google on a fix from their end, or if one is even coming.
This is a stub, please add to it if you know more.
Background
$2
[Incident]
[Company]'s response
Google have responded to the outage 24 hours later, warning users not to implement workarounds to fix the issue:
https://www.theregister.com/2025/03/10/google_chromecast_outage/
They say that a fix is "in the works" with no timescale offered.
Lawsuit
Consumer response
References
https://www.androidauthority.com/chromecast-device-authentication-error-3533424/ Article from Android Authority
https://www.themirror.com/tech/google-chromecast-down-users-report-1020960 - News article from the Mirror US
https://www.reddit.com/r/Chromecast/comments/1j7lhrs/the_chromecast_2s_device_authentication/ - Reddit thread discussing the issue in detail, with workarounds in the replies.