How to Fix Google Chrome Error – ERR_SSL_PROTOCOL_ERROR

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Err_ssl_protocol_error mean: What Does it Mean and How to Solve it?

Are you facing “this site can’t provide a secure connection ERR_SSL_PROTOCOL_ERROR” on Google Chrome? There are hundreds of thousands of users like you in the same boat as you. But don’t you worry as we’ve got your back. We will walk you through a series of straightforward steps that will help you terminate the err ssl protocol error like net::ERR_SSL_PROTOCOL_ERROR chrome and will leave you in peace.
err-ssl-protocol-error

Why Google Chrome Displaying ERR_SSL_PROTOCOL_ERROR?

Well, there could be tons of reasons behind it. It could be as simple as wrong system date and it could be a complex server issue. In any case, our course of action will probably help you throw this SSL error out of your Chrome.20

See Also: 6 Easy Ways to Fix Err Connection Timed Out Error in Chrome

Reasons behind ERR_SSL_PROTOCOL_ERROR Chrome

  1. Invalid System Time
  2. Firewall blocking the website or IP address
  3. Website could be blacklisted in the Hosts file
  4. Browser extension blocking the website
  5. Cookies and Cache not cleared for a long time
SSL establish trust and ensure customers for a safe visit and transactions over the net. We highly suggest you not to use a self signed certificate for any e-commerce site or any other sites which require sensitive data like bank or credit card information. If you want to create a self signing certificate in IIS, follow below steps.

How to Fix “ERR_SSL_PROTOCOL_ERROR Chrome”?

Here’s the course of actions to solve SSL Connection Error Chrome ERR_SSL_PROTOCOL_ERROR. If one doesn’t work out, try the next one and so on. Don’t shy away from trying any of these steps because you never know!
Here we’re explaining various solutions to fix “ERR_SSL_PROTOCOL_ERROR”:

Solution #1 Check the Date or Time of Your System

A possibility is there that an incorrect date and time settings may interrupt with the website you’re trying to connect and generate this ERR_SSL_PROTOCOL_ERROR. So, make sure that the system date and time aren’t behind or running ahead of an actual one.

The validity of the Certificate is an essential factor for the authentication process, which means also keeping tabs on the time it was signed and when the expiration will occur. So, any issue with your system’s time or date can cause this error at the time of authentication.

central-time-usa

Solution #2 Clear Your Browsing Data

Whether you’re getting this SSL connection error on Chrome or not, you should clear the cache and cookies of your browser on a regular basis. Follow the below steps to delete browsing data from your Google Chrome browser:
  • Launch Google Chrome
  • Press Ctrl + Shift + Delete
  • Set Time Range to “All Time
  • Check the checkbox for “Cookies and other site data”
  • Check the checkbox for “Cached images and files
  • Hit Clear Data Button
clear-cache-and-cookies

Solution #3 Clear Your SSL State

If the SSL State is not cleared, it might block SSL connection and cause the SSL Connection Error. Follow the steps below to clear the SSL state.

  1. Go to Start Menu > Control Panel > Network and Internet > Network and Sharing Center
  2. Now click on Internet Options from the bottom-left corner.
  3. A new Internet Properties window will appear.
  4. Now move to the Content tab and click on Clear SSL State.
clear-ssl-state
“The SSL cache was successfully cleared” alert should be on your screen.

Again, restart Chrome and check err ssl protocol error if net::ERR_SSL_PROTOCOL_ERROR is still there.

Still nothing? Move on to the next step.

Solution #4 Disable QUIC Protocol of Google Chrome

Disabling QUIC protocol will remove this error permanently from Chrome, here’s how you can do it.
  1. In your chrome browser URL, type chrome://flags/#enable-quic and hit enter.
  2. Experimental QUIC protocol would probably have been set as Default. Change it to Disabled.
  3. Now go to the bottom of the page and click on RELAUNCH NOW
disable-quic-protocol
Worked? Great. Didn’t? Try the next one.

Solution #5 Check Settings of Your Installed Antivirus Software

Not always the case, but sometimes your installed antivirus software can be a reason behind receiving an ERR_SSL_PROTOCOL_ERROR. These days all the available antivirus programs scan the entire websites for any malicious elements or security threats, including any outdated SSL/TLS version. For example, SSL 3.0 or TLS 1.0, which are no longer used due to its vulnerability issues.

Also, there are not any fixed steps to change the settings of your installed Antivirus, as it differs depending upon the UI of your installed antivirus software. If you can find out in your Antivirus software, then carefully make the change and see how it works. If the problem continues, then it’s recommended to reverting the changes you made in the settings option.

Solution #6 Check Firewall Settings

If the website or its IP address has been blocked by your firewall, chrome will display the Err SSL Protocol Error. Check your firewall settings and if you find that website/IP address, quickly remove it.

Solution #7 Remove or Disable Extension

Sometimes, the browser extensions could be causing the SSL connection error. It’s hard to know which one is behind it. The best strategy would be removing or disabling extensions one by one.
To view all Chrome Extension, type chrome://extensions/ in the URL bar.
remove-or-disable-extension

Solution #8 Remove the Hosts file

  1. Press Windows + R, type in C:\Windows\System32\drivers\etc & hit enter button
  2. You will find a file named hosts. Delete it.
remove-the-hosts-file
Restart Chrome and see whether this has had any effects or not. If not, try the next one!

Solution #9 Adjust Your Internet Security and Privacy Level

If the problem is persisting, then you can try by checking the Internet Security and Privacy level. As the possibility of blocking a particular website and facing ERR_SSL_PROTOCOL_ERROR is there if the privacy level is too high.

Follow Below Steps to Lower the Level:

  1. In the search bar of your computer, type “Internet Options”.
  2. Once the “Internet Properties” opens, navigate to the Security tab and look at the provided slider. If the slider is too high, then bring back to the Medium level (in the middle) and click on the “OK” button.
internet-security-and-privacy-level
Lastly, no matter which device you’re using, whether its Tablet, PC/Laptop, Smart Phones, Chromebook or any other web browser such as Opera, Brave, Chromium then no need to worry, in that also steps will remain the same. Follow the same in any of the mentioned web browser or the device installed into it and get your SSL Connection error solved.

We hope you’ve finally got rid of ERR_SSL_PROTOCOL_ERROR in Chrome.

How to Fix err_ssl_protocol_error in Android Devices

Likewise, if you’re using an Android device for browsing and you face this SSL Connection error, then steps may differ. But before heading for other solutions, do check some of the things like whether the website is SSL/TLS certificate enabled or not. If it’s installed and still facing that error then you might have to look for certain other things like, whether the Date & Time of the internet-connected device is right, the web browser is not updated, installed Antivirus, or any other Security application might be creating a problem. Moreover, if the problem persists, you can read this article for the same, from which you will get the solution.

Video Tutorial – How to Fix SSL Certificate Error in Google Chrome

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