How To Fix "ERR QUIC PROTOCOL ERROR" Error?

How To Easily Fix "ERR_QUIC_PROTOCOL_ERROR" Google Chrome Error 

QUIC (Quick UDP Internet Connections) is an experimental network protocol, the main purpose of which, is to provide security protection equivalent to TLS/SSL, but faster. It was designed not only to speed up the user browsing experience but also to improve online game graphics. Key features of QUIC are reduced connection establishment time, improved congestion control, forward error correction and connection migration.

You may have received the "ERR_QUIC_PROTOCOL_ERROR" message when trying to access a particular website. This error usually occurs when attempting to open web pages that are integrated with Google (such as Gmail or YouTube), however, it is possible for it to occur whilst trying to access other websites.

As mentioned earlier, QUIC is an experimental protocol - this feature is still being tested and might be unstable. Therefore, it could lead to a situation whereby you cannot access websites and the "ERR_QUIC_PROTOCOL_ERROR" error occurs. This error prevents users from visiting websites and states that the target site cannot be reached. To fix this problem you might need to check if QUIC is enabled in the Google Chrome browser and to disable it. Another reason for this error is installed third-party extensions - removing these extensions could also solve the problem. This guide outlines a number of possible solutions. We are using Google Chrome version 66.0.3359.117 - if you are using an older version, some settings may appear a little different, although the methods should remain the same in general.

err quic protocol error

Table of Contents:

Disable QUIC Protocol

The easiest way to fix this "ERR_QUIC_PROTOCOL_ERROR" error is simply to disable the QUIC protocol itself. Open the Google Chrome browser, type the "chrome://flags" address into the address bar, and then press Enter. Scroll down to find "Experimental QUIC protocol" and set it to "Disabled". If you want to find QUIC quicker, type "quic" into the "Search flags" box and select the protocol you are looking for.

disable quic protocol

Restart Google Chrome browser and try to visit a particular website again, see if this solved the problem and fixed the "ERR_QUIC_PROTOCOL_ERROR" error.

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Disable Or Remove Third-Party Extensions

If disabling the QUIC protocol does not fix the error, try to disable or remove any installed unknown third-party extensions from Google Chrome. Extensions are software programs that allow users to customize their browsing experience. Using extensions you can make Chrome compatible with your personal needs or preferences. It is possible that some installed extensions (probably unknown ones or those designed to block ads, pages, etc.) are preventing you from visiting a particular website and causing the "ERR_QUIC_PROTOCOL_ERROR" error. To access installed extensions, type the "chrome://extensions" address into the Chrome address bar and press Enter. You will see all installed extensions - remove unwanted/unknown entries by clicking the "Remove" button, or disable them by toggling the blue switch to the Off position. Restart Google Chrome and see if this fixes the "ERR_QUIC_PROTOCOL_ERROR" and if you are now able to visit a particular website.

disable or remove third-party extensions

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Temporarily Disable Your Firewall

A Firewall is a network security system responsible for monitoring and controlling incoming and outgoing network traffic. It builds a barrier (a wall or a firewall) between the trusted internal network and untrusted external networks. Firewall filters network traffic and lowers the risk of being affected by malicious software that can impact the security of a private network. If you are using third-party antivirus software, go to settings and disable the firewall. If you are not using any third-party antivirus software, type "firewall" into Windows Search and select the "Check firewall status" result.

temporarily disable your firewall step 1

In the Windows Defender Firewall window, find the "Turn Windows Defender Firewall on or off" option and click it.

temporarily disable your firewall step 2

Select the "Turn off Windows Defender Firewall (not recommended)" option under the network type that you use (private or public) and click "OK". Restart the Google Chrome browser and try to visit a particular website - see if you still receive "ERR_QUIC_PROTOCOL_ERROR". If this does not fix the problem, we suggest that you turn the firewall back on.

temporarily disable your firewall step 3

We hope this guide was useful and helped you to fix the "ERR_QUIC_PROTOCOL_ERROR" error, and you are now able to visit particular websites without problems. If you know of other solutions to this problem, not mentioned in our guide, please share them with us by leaving a comment in the section below.

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