ERR_QUIC_PROTOCOL_ERROR is a common error encountered by Chrome users. This error may prevent users from accessing certain websites or make it difficult to browse the internet. The error occurs due to a problem with the QUIC protocol, a Google-developed networking protocol that aims to improve web browsing performance. Here are a few steps that users can follow to fix ERR_QUIC_PROTOCOL_ERROR.

1. Clear browsing data:

Clearing browsing data is the first recommended step in fixing this error. To do this, open Chrome and click on the three-dot menu icon at the top right of your screen. Next, select “More tools” and then click on “Clear browsing data.” Choose the time range you want to clear, and make sure that “Cookies and other site data” and “Cached images and files” are selected. Once you have made your selection, click on “Clear data” to clear your browsing data.

2. Disable QUIC protocol:

To disable the QUIC protocol, you need to open Chrome and type “chrome://flags” in the URL bar. Search for “Experimental QUIC protocol” and then select “Disabled” from the drop-down menu. Next, click on the “Relaunch Chrome” button to apply the changes.

3. Disable antivirus software:

Antivirus or security software can sometimes interfere with the QUIC protocol and cause ERR_QUIC_PROTOCOL_ERROR. To fix this, you can temporarily disable your antivirus software and check if the error persists. If disabling antivirus software helps, then you should consider adding exceptions for Chrome in your antivirus or security software settings, so that they don’t interfere with the QUIC protocol.

4. Reset network settings:

Resetting network settings is another recommended step in fixing the ERR_QUIC_PROTOCOL_ERROR. To reset network settings in Windows, open the Control Panel and click on “Network and Sharing Center” followed by “Change adapter settings.” Right-click on your network adapter and select “Disable.” Wait a few seconds and then right-click again and select “Enable.” This will reset your network settings.

5. Update Chrome:

Keeping Chrome up-to-date can also prevent ERR_QUIC_PROTOCOL_ERROR. Open Chrome and click on the three-dot menu icon at the top right of your screen. Select “Settings,” then click on “About Chrome” under “Help and feedback.” Chrome will automatically check for updates and apply them if available. Once updated, restart your browser and check if the error is fixed.

In conclusion, ERR_QUIC_PROTOCOL_ERROR is a common error that can be resolved by following the steps outlined above. If these solutions do not work, consider contacting Chrome support or seeking solutions from online forums or message boards.