Over the weekend, 9to5Google reported that second-gen Chromecast and Chromecast Audio devices displayed an “Untrusted device” error message, preventing users from casting audio and video content onto their screens of choice.

Second-generation Chromecast and Chromecast Audio devices are facing a problem that prevents them from casting content. If you try to use an affected device, you'll see one of two errors -- either, "Untrusted device: [name] couldn't be verified. This could be caused by outdated device firmware," or "We couldn't authenticate your Chromecast."

Chromecast (2nd Gen) and Audio users are locked out of streaming due to an "Untrusted Device" error—here's why it's happening and what to expect next.

But Google assured users that the “untrusted device” error was a simply a bug. Google also advised users not to reset their devices as the company worked on a fix. Google hasn’t specified the reason for the “untrusted” errors, but some users have speculated that expired SSL certificates were to blame.

Chromecast users have encountered an 'untrusted device' error affecting older generation devices, particularly the 2nd generation Chromecast and Chromecast Audio. Google has acknowledged the problem and is working on a solution,

Chromecast's 'Untrusted device' error seems to have stemmed from an intermediate Certificate Authority (CA) that expired on March 9, 2025.

Many Google Chromecast users found themselves suddenly locked out of their devices today; here's what we know so far.

Beginning this week, attempting to connect your phone to a second-gen Chromecast or Chromecast Audio results in untrusted device or authentication errors. The unhelpful popup suggests this could be due to outdated firmware,