6 Ways To Fix ‘ERR_QUIC_PROTOCOL_ERROR’ in Chrome


Google Chrome is one of the most popular web browsers in the world, known for its speed, security, and user-friendly features.

However, like any software, Chrome is susceptible to errors that can disrupt your browsing experience. One such error is the “ERR_QUIC_PROTOCOL_ERROR,” which can be frustrating for users.

In this comprehensive guide, we will explore the details of the ERR_QUIC_PROTOCOL_ERROR in Chrome. We’ll explain its significance, potential causes, and effective solutions to help you resolve this issue and enjoy seamless browsing on the Chrome browser.



The ERR_QUIC_PROTOCOL_ERROR is an error message that you may encounter while using Google Chrome to browse websites. It is associated with the QUIC protocol, which stands for Quick UDP Internet Connections.

QUIC is a transport layer protocol developed by Google to improve the security and performance of web communication. It is designed to replace the traditional Transmission Control Protocol (TCP) used by most websites.

When you see the ERR_QUIC_PROTOCOL_ERROR, it means that there was an issue while establishing a connection to a website using the QUIC protocol. This error typically prevents you from accessing the website and may appear as a page with a message like “This site can’t be reached” or “Aw, Snap!”

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Common Symptoms of the Error

Before we delve into the causes and solutions, let’s take a look at some common symptoms associated with the ERR_QUIC_PROTOCOL_ERROR:

  1. Error Message: The primary symptom is the appearance of an error message that reads “ERR_QUIC_PROTOCOL_ERROR.”
  2. Inability to Access Websites: When this error occurs, you are unable to access the specific website or web pages affected by the error.
  3. Connection Timeout: Your attempts to load the webpage may result in a connection timeout or a blank page.

Now that we understand the symptoms, let’s explore the potential causes of the ERR_QUIC_PROTOCOL_ERROR.

Possible Causes of the Error

To effectively troubleshoot and resolve the ERR_QUIC_PROTOCOL_ERROR, it’s crucial to identify its underlying causes. Here are some common reasons behind this error in Chrome:

  1. QUIC Protocol Issues: The QUIC protocol may encounter issues or conflicts while trying to establish a secure connection with the website.
  2. Network Connection Problems: Network-related issues, such as packet loss, high latency, or a weak Wi-Fi signal, can disrupt the QUIC protocol’s operation and trigger the error.
  3. Browser Cache and Cookies: Corrupted or outdated browser cache and cookies can sometimes interfere with the QUIC protocol, causing the error.
  4. Firewall or Antivirus Software: Certain firewall or antivirus software may block QUIC protocol connections, mistakenly identifying them as threats.
  5. Browser Extensions: Incompatible or outdated Chrome extensions can conflict with the QUIC protocol, leading to connection errors.

Now that we’ve identified the potential causes, let’s explore the solutions to fix the ERR_QUIC_PROTOCOL_ERROR:

How to Fix ERR_QUIC_PROTOCOL_ERROR in chrome

The solution for fixing the ERR_QUIC_PROTOCOL_ERROR is mentioned beneath. May be one of them will work for you. Let’s have a look on them.

Method 1: Using the chrome://flags Command

Step 1: Go to the Chrome browser window. Open a new tab.

Step 2: Enter the command “chrome://flags” in the address bar. This will navigate you to the settings menu.

Step 3: A notification/ message box will pop up saying “Careful; these experiment may bite”. That will cause to issue a warning such as “experimental features”. Don’t panic! This procedure is safe and secured. Thus, ignore it and go ahead.

Step 4: Once the above step is completed successfully, scroll down to find the Experimental QUIC protocol feature. Or else, in case you are not able to find it, press CTRL+F key.

Step 5: Navigate to the “Experimental QUIC protocol” in the box and press enter.

Step 6: Now select the Disabled option from the drop down box. Relaunch the chrome once it is accomplished. The error will get disappear.

Method 2: Disabling Browser Extensions

As we have mentioned above, the interference of third party can affect the work efficiency of the Google Chrome. We should disable it in order to resolve them.

Step 1: Go to the Chrome window. Open a new tab.

Step 2: Enter the command “chrome://extensions” in the address bar. And press Enter.

Step 3: Once it is done, navigate to the Extensions. Disable all other extensions that are not required.

Step 4: As the above steps are accomplished then Reboot the computer. Now click on the Google Chrome browser window. Open a new tab in the browser window. Verify if the error still prevails.

Note: If you are still facing the problem even after disabling the connection, then it is advisable to disable the third party extension from the root. Then, click on the Google Chrome browser window. Open a new tab in the browser window. Verify if the error still prevails.

Method 3: Resetting the Browser

Step 1: Go to the browser window. Click on the three vertical dots in the top right corner. A drop down menu appears. Then select Settings.

Step 2: Scroll down until you get the Advanced option. Now select it in order to expand it.

Step 3: Once the above step is accomplished, click on the Reset option and then on Relaunch Chrome.

Note: As data will be permanently deleted once you click on the Reset option, it is advised, to always ensure to save all the tabs and links. Then, click on the Google Chrome browser window. Open a new tab in the browser window. Verify if the error still prevails.

Method 4: Checking the Proxy or Firewall Settings

Step 1: Press Windows key + R and enter the command “inetcpl.cpl”. Navigate through the Internet Properties section.

Note: If this works for you then good. Or else, search for “Control Panel” in the start or cortona search bar. Now, select the “Internet Options” or the “Network and Internet”option.

Step 2: Now click on the “Connection” option. Select “LAN Settings”. Always ensure that there is no issue regarding Firewall or Proxy Browser. If you encounter any errors then fix those first.

Step 3: Now uncheck the option called “Use a Proxy Server for your LAN”. Once it is done, check the “Automatically detect settings” option.

Step 4: Finally, Click on the option “OK” then “Apply” and then “Restart” the computer.

Note: Click on the Google Chrome browser window. Open a new tab in the browser window. Check if the error still prevails.

Method 5: Temporarily Disabling the Firewall Settings

Step 1: The first and foremost step is to locate any Anti-virus programme present in the system Tray (which is depicted by an upward facing arrow). Now, Right click on it and Select “Disable”.

Step 2: Now choose and click on a short period for the disabling of the anti-virus programme.

Step 3: Then open the Chrome browser to inspect whether the error is solved or not.

Step 4: If the issue is yet not solved, then navigate to “System and Security” setting on the computer by searching for it in the search bar or Cortona. Or you can press Window key + I to open the “Control Panel” and then select it.

Step 5: Now Select the “Windows Firewall” option. Then select the “Turn Windows On or Off” option from the panel present on the Left hand side.

Step 6: Now Select the option that turns off the firewall and then “Restart” the computer.

Note: Always inspect and ensure to turn on the Windows Firewall by following the same steps mentioned above irrespective of whether the issue is solved or not. Then, click on the Google Chrome browser window. Open a new tab in the browser window. Verify if the error still prevails.

Method 6: Scan for Viruses 

A Computer Viruses is a type of malicious computer program which is when executed, it replicates itself and affects parts of the computer. As we all know, have always been a threat to  the computer system.

It not only affects your computer system but also has the capability to steal privacy passwords, documents, pictures, videos and can send it to the creator of the virus. Often the term virus id misunderstood as Malware.

Let’s get these things clear. Malware is a malicious computer virus with harmgul software but virus is only a computer program. The different types of malware are worms, keyloggers, spyware, rootkits, Trojan horse, bootkits.

Step 1: Search in the search field for “Microsoft Security Essentials”. And then click on Microsoft Security Essentials.

Step 2: A new window pops up. Choose Full to scan your computer completely and thoroughly.

Step 3: Now, click on the Scan Now. Then Scan your computer thoroughly.

Step 4: Once you have successfully completed the steps mentioned above, Check if the problem is fixed or not.

Now, talking about Mac Books, there are a few chance of facing the ERR_QUIC_PROTOCOL_ERROR. But still you want to be ensure about it then you can scan with your antivirus installed in your Mac Book.

Method 7: Reset Chrome 

I know you have already followed each and every step carefully for disabling QUIC protocol and clearing cache but you have failed then you absolutely need to choose a bit more different and drastic procedure.

Here we are back with another method which is to reset the browser. To do the same follow the steps mentioned below –

Step 1: Go to your Browser window which is Google Chrome. Now click on the three vertical dots situated on the right top corner.

Step 2: A drop down menu appears. From that select Settings. On that page scroll down until you find Advanced. Now click on it to expand the settings of advanced options.

Step 3: Scroll down again to find Reset at the bottom of the page. A message will pop up with a warning that “All the temporary files as well as extensions will be removed.” As no harm will be caused to your computer system so this message is ignored.

Step 4: So what are you waiting for/ Click on the Reset button on the monitor. Now Restart the Chrome Web Browser. Open a new tab in the browser window. Verify if the error still prevails.

Method 8: Disable VPN

This has recently came to our prior notice that many of the Chrome users are facing this common issue of connection problem and every solution available on the internet is not working proficiently for them.

The VPN and the Proxies interfere with the speed of the internet connection as they bypass the default service provider’s connection. VPN can cause issues and instability including the error of ERR_QUIC_PROTOCOL_ERROR.

A better method to verify whether this extension of VPN is impacting the internet speed and causing issues. This can be done by using a different web browser. Let’s try by disabling the VPN. After disabling you will be able to bring results.

If the issue is solved by disabling the VPN then it is proved that the cause of the error ERR_QUIC_PROTOCOL_ERROR was none other than VPN. We will suggest you to use premium or you can go for reliable VPNs such as VyprVPN and ExpressVPN.

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Now, as we have arrived to the conclusion after reading all our methods, we really hope that the procedures and methods mentioned above will certainly work for you. We have tried our best to elaborate the main issue, causes and effects.

Last but not the least, ERR_QUIC_PROTOCOL_ERROR is usually caused due to issues related to Web Browser. The first and foremost step you ought to do is to check for connectivity and internet speed of your network.

Always ensure that you stay connected to the internet throughout the whole procedure. Take care of all the extensions which needs to be attached for connectivity. Also, you need to take care that no connection gets disconnected during the whole procedure.

I know the procedures mentioned above might have solved most of the problems. If there are still some people who come in the category of their error ERR_QUIC_PROTOCOL_ERROR not being solved then you can go for other websites to find a cure to your injury.

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