How To Easily Fix "ERR_QUIC_PROTOCOL_ERROR" Google Chrome Error 

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

If you are reading this, then most probably you have got the "ERR_QUIC_PROTOCOL_ERROR" while trying to access a particular website. Usually this error occurs when users are trying to open web pages that are integrated with Google (like Gmail or YouTube), however, it is possible for this error to occur while trying to access other websites as well.

As we mentioned earlier, QUIC is an experimental protocol which means this feature is still being tested and can be unstable, which can lead to a situation where you cannot access websites and the "ERR_QUIC_PROTOCOL_ERROR" error occurs. This error stops users from visiting websites and states that the site cannot be reached. In order to fix this problem you might need to check if QUIC is enabled in your Google Chrome browser and to disable it. Another reason why you are getting this error could be the installed third-party extensions and removing these extensions could solve the problem as well. In this guide you are going to find thoroughly described solutions, all you need to to is to read our guide below and follow the steps one by one. We are using Google Chrome version 66.0.3359.117, if you are using an older one, then some settings may look a little bit different, however, everything should be the same in general.

err quic protocol error

Table of Contents:

Disable QUIC Protocol

The easiest possible way to fix this "ERR_QUIC_PROTOCOL_ERROR" error is simply to disable the QUIC protocol itself. To do so you will need to open your Google Chrome browser and type the "chrome://flags" address into the Chrome address bar and press Enter. Scroll down to find "Experimental QUIC protocol" and set it to "Disabled". If you want to find QUIC quicker, then 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 could not fix the error, then you might want to disable or remove any installed unknown third-party extensions from your Google Chrome browser. Extensions are software programs that allow users to customize their browsing experience. By using extensions you can make Chrome compatible with your personal needs or preferences. It is possible that some of the installed extensions, most probably the unknown ones or those which are 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 extensions by clicking the "Remove" button or disable them by toggling the blue switch to the Off position. Restart Google Chrome and see if this fixed 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 that is responsible for monitoring and controlling incoming and outgoing network traffic, it builds a barrier (a wall or a firewall) between trusted internal network and untrusted external network. 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 a third-party antivirus software, then go to it's settings and disable firewall. If you are not using any third-party antivirus, type "firewall" into Windows Search and select the "Check firewall status" result.

temporarily disable your firewall step 1

In Windows Defender Firewall window find "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 your Google Chrome browser and try to visit a particular website, see if you are still getting the "ERR_QUIC_PROTOCOL_ERROR". If this does not fix the problem, then we suggest to turn your firewall back on.

temporarily disable your firewall step 3

That's it, 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 any problems. If there is a method that solved this problem for you and it is not mentioned in our guide - do not hesitate to share it with us and with the others by leaving a comment in our comment section below.

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