Google Confirms Fix for Chromecast Outage Caused by Expired Certificate

Second-generation Chromecast and Chromecast Audio devices stopped working due to an expired authentication certificate, with Google advising users not to factory reset their devices.

An expired security certificate on March 9, 2025, caused second-generation Chromecast and Chromecast Audio devices to stop casting content.
Affected users encountered 'untrusted device' error messages, preventing the devices from connecting to Google's backend systems.
Google has acknowledged the issue and is working on a fix, advising users not to perform a factory reset as it will not resolve the problem.
A workaround involving manually adjusting device dates has been shared online but is inconsistent and may not fully restore functionality.
While the Chromecast product line was discontinued in 2023, Google has committed to resolving this issue for existing users.