ERR QUIC PROTOCOL ERROR is a frequent visitor to Google Chrome and other browsers based on the Chromium project, such as Microsoft Edge and Yandex.Browser. The cause is associated with issues when establishing a connection to a web resource via the QUIC protocol. The good news is the issue is not serious – there is one main solution and several additional ones available for it.



If there are some problems with the QUIC protocol, the user can always deactivate its use in his browser. You can’t do this in the regular settings, because the function is experimental.

  • Start the Google Chrome browser;
  • type chrome://flags in the address bar and press ENTER;
  • in the empty search box simply type QUIC and look for the “Experimental QUIC protocol” option;
  • in the dropdown menu next to the option select “Disable”;
  • click on the “Restart” button to make changes.

On other browsers the QUIC protocol can be disabled in the same manner. The only difference is what to enter in the address bar. Here are some useful examples:

  • Opera→opera://flags
  • Edge→edge:://flags
  • Yandex.Browser→browser://flags

Deactivating the QUIC protocol does remove the ERR QUIC PROTOCOL ERROR, but the latter can always be replaced by some other error. And if this happened, then perhaps the problem was not in the QUIC protocol at all, but in something else. What to do next – you need to sort out on your own as you go along.

QUIC is disabled but errors still appear – what to do?

Some users on the web have noticed that their QUIC PROTOCOL ERR appears even after disabling the QUIC protocol. If this happens, there are a number of additional solutions you can use. We can’t vouch for their effectiveness, but it’s worth trying them out, especially if you don’t want to disable QUIC or are at a literal dead end.

  • A VPN is an extremely useful thing if you want to access web resources that are blocked or inaccessible for your country. Unfortunately, sometimes a VPN does the opposite by blocking access to all or some specific sites. Turn off the VPN and test your browser. If you’re not using a VPN, on the contrary, try to use it to go to the desired site.
  • Extensions are designed to “extend” the existing functionality of the browser. However, extensions can restrict access to a number of web resources. Disable all (!) extensions, restart the browser and check for the ERR QUIC PROTOCOL ERROR. If the error disappears, start enabling the extensions again one by one to find the culprit by elimination method.
  • A third-party firewall may be blocking connections to some websites. The same goes for antiviruses that have built-in firewall features. Disable third-party security software on your PC and check your browser. You can go one step further and disable the Windows system firewall (!), as it can also sometimes block some network connections by mistake.
  • The QUIC protocol error could be the result of a problem with the website itself. In this case, there is nothing left but to wait for the problem to be solved by the owners of the website itself.
    Have you installed any new applications or drivers lately? Use a restore point to restore your system to a previous, more stable state. Just run WIN+R→rstrui.exe, select the appropriate restore point and click “Done”.

As you can see, getting rid of ERR QUIC PROTOCOL ERROR is usually quite easy. If you still have additional questions, please share them in the comments.

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