How to fix ERR_SSL_PROTOCOL_ERROR (Windows, Mac OS, Android, iOS)

Incorrect date and time settings might be responsible for the ERR_SSL_PROTOCOL_ERROR error. Set the correct time and date in your device and try visiting the website again.

Maybe the antivirus itself, i.e. its settings, is responsible for this error message. Check out the settings, apply necessary modifications (ask the support staff of the antivirus software for advice) and reload the browser.

Clearing the SSL state can help you fix the ERR_SSL_PROTOCOL_ERROR error message. Follow the steps below, please, to learn how to do it:

1. Click the three-dot icon in the upper right-hand corner of the screen and select Settings.
2. Scroll down to the bottom and click on Advanced (Settings).
3. Find Open proxy settings, by scrolling down or by using the search bar.
4. On the Internet Properties window that will appear, click on the Content tab and click on the Clear SSL State button.

Note: Step 4 may vary from one operating system to another.

When we visit SSL-enabled websites, our SSL/TLS protocols communicate with the server of the website. There are times when the SSL/TLS version of a website might not be compatible with your settings, because Google Chrome disables deprecated SSL/TLS protocols by default, meaning that you need to enable them. To do that, follow the steps below:

1. Click on the three-dot icon in the upper right-hand corner of the screen and click on Settings;
2. Go to Advanced Settings;
3. Click on Open Proxy settings;
4. Tick the check boxes next to all the SSL and TLS versions.
5. Save the changes and close the window.
6. Close and reopen the Chrome browser.

Note: This procedure isn’t entirely safe as the older, insecure SSL/TLS protocols can expose you to risk.

QUIC (Quick UDP Internet Connections) is a service that provides Google’s servers a TLS/SSL equivalent connection, and disabling it might help you fix the ERR_SSL_PROTOCOL_ERROR issue. This protocol is enabled in Chrome, by default. To disable it follow the steps below:

1. Copy chrome://flags/#enable-quic, paste it into the address bar and press Enter;
2. Click on the drop-down menu next to Experimental QUIC Protocol, labeled as Default, and click on Disable;
3. Close Google Chrome and reopen it again.

Note: If disabling the protocol didn't help, make sure to revert the changes you made, following the steps below and setting the protocol to Default.

Since getting the ERR_SSL_PROTOCOL_ERROR is quite random, a solution like restarting the web browser can be very efficient. Just close the web browser and reopen it again and you should be able to access the website you wanted.

Clearing the cache files might be all you need to do to resolve the issue. If you are not sure how to clear the cache, check out the don't know how to clear the browser cache guide. Also, you might want to consider clearing the cookies (to learn how, check the don't know how to delete browser cookies guide).

When we visit SSL-enabled websites, our SSL/TLS protocols communicate with the server of the website. There are times when the SSL/TLS version of a website might not be compatible with your settings, because Google Chrome disables deprecated SSL/TLS protocols by default, meaning that you need to enable them. To do that, follow the steps below:

1. Click on the three-dot icon in the upper right-hand corner of the screen and click on Settings;
2. Go to Advanced Settings;
3. Click on Open Proxy settings;
4. Click on Advanced and find the Security section.
5. Tick the check boxes next to all the SSL and TLS versions.
6. Click on Apply and close the window.
7. Close and reopen the Chrome browser.

Note: This procedure isn’t entirely safe as the older, insecure SSL/TLS protocols can expose you to risk.