Google Chromecast Users Face ‘Untrusted Device’ Error – Here’s How to Fix It

Secure Your Streaming with PureVPN – The Best Chromecast VPN

Before diving into the recent Chromecast outage, let’s address a crucial aspect of streaming, security and reliability. If your Chromecast or any other device suddenly malfunctions, having a secure connection is vital.

A trusted VPN helps prevent ISP throttling, security vulnerabilities, and even region-based restrictions on content. Whether you’re streaming Netflix, YouTube, or exploring new libraries, a VPN ensures you stay connected without interruptions.*

Read: Best Chromecast Alternatives

Chromecast Users Hit with ‘Untrusted Device’ Error

Over the past few days, thousands of Google Chromecast (2nd Gen and Chromecast Audio) users have reported a sudden malfunction, rendering their devices useless.

The problem, which started on March 9, 2025, has affected Chromecast owners worldwide, displaying an error stating that their device is ‘untrusted’ and cannot be authenticated.

Reports suggest that the issue is due to an expired authentication certificate, preventing older Chromecast devices from securely connecting to Google’s servers. Users have taken to Reddit, Google Nest forums, and other platforms to voice their frustration as their streaming devices fail to function.

Google’s Response and Solution

Google has acknowledged the problem and is actively working on a fix. The company strongly advises against performing a factory reset on affected devices, as this will not resolve the issue. Instead, users are encouraged to wait for an official update.

“We’re aware of an emerging issue impacting Chromecast 2nd Gen and Chromecast Audio devices and are working on a fix. Do not factory reset your device – we will keep you all updated when the fix rolls out. If you have already factory reset your device, we will provide instructions to set your device back up as soon as possible.”

-Google

While Google has not provided a timeline for a fix, the root cause appears to be an expired 10-year-old security certificate. A software patch is expected to be rolled out soon.

How to Fix the Chromecast ‘Untrusted Device’ Error Right Now

While waiting for Google’s fix, here are some troubleshooting steps to help mitigate the issue:

1. Check for Software Updates – Ensure your Google Home app and Chromecast firmware are updated to the latest version.
2. Restart Your Router and Chromecast – Sometimes, refreshing your internet connection helps re-establish communication.
3. Use a Secure VPN Like PureVPN – Some users have reported that using a VPN helps bypass the verification issue by connecting to a different server. PureVPN can help provide a stable and secure connection.
4. Avoid Factory Reset – If you’ve already done this, you’ll need to wait for Google’s upcoming instructions.

Future-Proof Your Streaming with PureVPN

If you rely on Chromecast for streaming, it’s crucial to protect your device from connectivity issues and geo-restrictions. PureVPN offers a seamless streaming experience, enhanced security, and unrestricted access to global content.

Whether you’re dealing with outages or want to explore content from other regions, PureVPN is the best Chromecast VPN solution.

Connect your Chromecast to your Wifi router

• On the Connect Chromecast to your Wi-Fi screen, you will see a list of Wi-Fi networks available to you. Select the Wifi hotspot or router that you set up earlier. (In this example, we named it PureVPN.)

•  Enter the password for your Wifi hotspot or router, then click Set Network.

• You are now connected to your VPN-enabled Wifi router. Awesome! You are ready to cast via your VPN connection!