11 Fixes for “ERR_SSL_PROTOCOL_ERROR” on Chrome


Using a PC, you may have seen the ERR_PROTOCOL-ERROR on your browser. This error can occur for various reasons, but in most cases, it will be due to a system setting that needs to be configured. The article has ways how to fix the ERR_PROTOCOL-ERROR in chrome. Read this article to find out how.

Google Chrome has the perfect name for a browser. It is both beautiful and efficient. But, sometimes, it can be a little too efficient. If you've been browsing the internet and come across the ERR_PROTOCOL_ERROR message in Google Chrome, don't worry – there's an easy fix. In this article, we'll walk you through what causes this error and how to get rid of it so you can return to your browsing.


ERR_SSL PROTOCOL_ERROR is a common error that occurs when trying to access a website over HTTPS. A misconfiguration usually causes the error on the server side. Still, a problem with your browser can also cause it, or your browser could not establish a secure connection to the website. The error can be due to several factors, but the most common cause is a misconfiguration on the server.

What Are the Causes of ERR_SSL_PROTOCOL_ERROR?

What Are the Causes of ERR_SSL_PROTOCOL_ERROR

There are a few different causes for the ERR_SSL_PROTOCOL_ERROR message in Chrome, and some of them are:

  • One cause is outdated SSL certificates.
  • Using an outdated version of Chrome.
  • The system time and date are wrong
  • The chrome extensions are blocking the website
  • The chrome cache and cookies are not cleared
  • The antivirus and firewall are blocking the IP address.

1. Clear Chrome's Data

When you visit a website, Chrome stores certain information from that site on your computer, this data can include images, cookies, and browsing history. Over time, this data can accumulate and cause problems with loading websites. One way to fix the ERR_PROTOCOL_ERROR error is to clear your Chrome's data.

Follow these steps to clear data:

Step 1: In the upper-right corner of your browser, click the Menu icon (the three dots).

Step 2: Select More Tools, and then Clear Browsing Data.

Clear Browsing Data

Step 3: At the top, choose a time range. To delete everything, select All Time.

Step 4: Next to “Cookies and other site data” and “Cached images and files,” check the boxes.

Cached images and files

Step 5: Click Clear Data.

2. Check the Date and Time of the System

You can check the system time and date on your computer. The ERR_PROTOCOL_ERROR can occur if the system time and date are not set correctly. To check the system time and date on Windows,

Step 1: Press the Windows key + X on your keyboard.

Step 2: Select the “System” option from the pop-up that appears. The settings menu will appear.

Step 3: In the Find Settings window, type Time in the search bar.

Find Settings

Step 4: Select Change date and time settings from the results list.

Change date and time

Step 5: Set the correct time and date on your computer, then try accessing the website to see if the error has been fixed.

3. Clear the SSL State

If you're getting the ERROR_PROTOCOL_ERROR in Chrome, it's likely because of an issue with the SSL cache. You can clear the SSL cache by following the steps below:

Step 1: Go to Start >Control Panel.

Step 2: Click on Network and Internet, then Network and Sharing Center.

Step 3: Click on Internet Options.

Step 4: In the Internet Properties pop-up, go to the Content tab.

Internet Properties

Step 5: Click Clear SSL Cache.

4. Check and Disable the Antivirus and Firewall Temporarily.

If you see the ERR_PROTOCOL_ERROR message in Chrome, it might be because your antivirus or firewall is blocking certain Chrome processes. You'll need to disable your antivirus and firewall to fix the problem temporarily. Antivirus programs are important for protecting your computer from malware, but they can sometimes cause problems with Chrome. Ensure that your antivirus program is up-to-date and compatible with your Chrome version.

Restart Chrome and try loading the page again. You can enable your firewall and antivirus program if there's no problem.

5. Disable Chrome Extensions

If you see the ERR_PROTOCOL_ERROR in Chrome, it's often due to a problem with one or more of your Chrome extensions. To disable your Chrome extensions:

Step 1: Click the menu button (three dots) in the top-right corner of the browser window.

Step 2: Select “More Tools.”

Step 3: Select “Extensions.”


Step 4: Tap the Remove option for each extension.


Step 5: Close and restart Chrome.

6. Update Chrome

If you're getting the ERR_PROTOCOL_ERROR in chrome, it's likely because you're using an outdated browser version. To fix this, update your chrome browser to the latest version. You can do this by going to the Chrome Menu> click Help>About Google Chrome. It will check for updates and install them if necessary.

About Google Chrome

updates and install

7. Disable QUIC Protocol of Chrome

Another way to fix this error is by disabling the QUIC protocol. Follow these steps below.

Step 1: In the URL bar of Chrome, type “chrome://flags” (without the quotes) and hit Enter. You should see a list of advanced settings for the browser.

Step 2: Scroll down until you see an entry labeled “Experimental QUIC protocol.” Click the Disable link to the right of it.

Experimental QUIC protocol

Step 3: Close and restart Chrome. The changes should take effect immediately.

Step 4: Try loading the page again. If it still doesn't work, try repeating steps 2 and 3, but this time choose the “Enable” option instead of “Disable.

8. Check the SSL Certificate

If you see the ERR_PROTOCOL_ERROR message in your Chrome browser, it's usually caused by a problem with the website's SSL certificate. You can usually fix this error by checking the SSL certificate for any problems.

If you're getting the ERR_PROTOCOL_ERROR in Chrome when accessing a website, it's likely due to a problem with the SSL certificate. HTTPS websites require an SSL certificate to be downloaded before users can access them.

You may see this error when an SSL certificate expires or is no longer valid foranotherr reason. To fix it, you'll need to get a new SSL certificate from your website's hosting provider.

9. Update Operating System

If you see the ERR_PROTOCOL_ERROR message in Chrome, your operating system may be outdated. To fix this problem, update your OS to the latest version.

Step 1: Check for updates to your macOS by going to the Apple icon in the upper left-hand corner of your screen. From there, select “About This Mac” and then “Software Update.”

Software Update

Step 2: If any updates are available for your mac OS, install them and restart your computer.

Step 3: Once your computer has restarted, try opening Chrome again.

If you have turned on automatic updates, this cannot be the reason for the error.

10. Check the Internet Security and Privacy Level

If you see the ERR_PROTOCOL_ERROR error in Chrome, it's usually because of a problem with your internet security or privacy settings. To fix the problem, you'll need to check your internet security and the privacy level and ensure it's set to a level allowing Chrome to access the internet.

Try lowering your privacy settings. Here's how:

Step 1: Type “Internet Options” in the computer search bar.

Internet Options

Step 2: The “Internet Properties” window will open.

Step 3: Click on the “Security” tab.


Step 4: Look at the slider bar and reduce the privacy level to “Medium.”

Step 5: Click “OK.”

11. Check the Server Log for Error Message

If you see the ERR_PROTOCOL_ERROR message, there's likely an issue with the website you're trying to visit. It could be a problem with the website's server, or it could be a problem with your computer's settings. If you can visit other websites without issue, the ERR_PROTOCOL_ERROR problem likely lies with the website itself. Try contacting the website's administrator to see if they can help resolve the issue. However, it's also possible that the issue is with your browser or network connection.

If neither of those solutions works, there could be a problem with your computer's security settings. Try fixing your Chrome browser's security exceptions list. You may need to contact your IT department for help if that doesn't work.


If you're still seeing the ERR_PROTOCOL_ERROR in Chrome, you can try a few other things. You can clear your cookies and cache or try using a different browser. If none of these solutions work, you may need to contact your ISP or network administrator for help.

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