Google’s second-generation Chromecast and Chromecast Audio devices have encountered authentication issues due to an expired intermediate Certificate Authority (CA) certificate, marking a significant challenge for the streaming platform that has been a cornerstone of Google’s home entertainment strategy since 2013. The certificate, which was valid for 10 years, expired on March 9, 2025, causing users to receive “untrusted device” error messages when attempting to cast content.
Authentication failures occur when apps try to verify device legitimacy, preventing users from casting video or audio content to affected devices. The security verification process, which builds upon Google’s broader device authentication protocols, specifically impacts all second-generation Chromecast and Chromecast Audio devices, with the error appearing prominently in applications like YouTube during casting attempts.
Google has confirmed the issue and initiated a fix rollout. The company has advised users against performing factory resets on their devices, as this can complicate the situation by preventing Wi-Fi reconnection. For those who have already performed factory resets, Google recommends setting up the Chromecast using a phone with its date set prior to March 9, 2025, to bypass authentication issues during the setup process.
The technical root of the problem stems from Google’s implementation of the DIAL protocol, which was originally developed in collaboration with Netflix. Google had modified this protocol to prevent competitor devices from achieving compatibility, implementing a security measure that expired on the aforementioned date. The proprietary modification is part of Google’s continued efforts to strengthen authentication security across its product ecosystem.
The fix is being deployed gradually and requires devices to maintain an internet connection to receive the update. Users who performed factory resets may experience extended waiting periods before their devices return to full functionality. The situation highlights the broader challenges of managing digital certificates and authentication systems in consumer devices, an issue that has become increasingly important as more devices rely on secure communication protocols.
In a parallel development, Google has released an unrelated update for Chromecast with Google TV devices, incorporating security patches through January 2025 and system stability improvements. The separate update, part of Google’s broader security enhancement initiatives, has reportedly affected certain features, including local media implementation and USB drive detection capabilities.
Sources: Indian Express, How-To Geek, Lifehacker, FlatpanelsHD
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