The SSL_ERROR_NO_CYPHER_OVERLAP message is mainly associated with Mozilla Firefox. When you browse websites using Firefox, most of the weblinks can get blocked and results in this error. 

When you access two links simultaneously, you may encounter this error. Thereafter, you will be notified with a “Secure Connection Failed” pop up error message.

You can also get this error due to factors including outdated Firefox, disabled SSL3, removing the RC4 support from Firefox, and many more. 

So, if you are getting this error, fix it to avoid further issues on Firefox. Here, we will guide you on how to resolve it. 

How to Solve the Error Code: ssl_error_no_cypher_overlap?

This section comprises the key methods to solve the connection failure error. Hence, implement the methods accordingly as per your convenience.  

Method 1: Uninstall and Install Latest Firefox

If you have an outdated version for Firefox, you can come across this error. In that case, you need to update the latest version of firefox. 

How to Uninstall the Firefox? 

How to Uninstall the Firefox

If you want to uninstall Firefox, you need to go through the below-mentioned steps:

  • Hold the windows and R key together. This will open the Run dialog box. 
  • In the Run dialog box, write “appwiz.cpl”. Hit the Enter button next.
  • This will open the “Uninstall or change a program” tab. From there, choose “Firefox”.
  • Right-click on it and choose the “Uninstall” option from the drop-down menu.

We hope you have now uninstalled the outdated version for Firefox. Next, you need to install the latest version of firefox in the device.

How to Install Firefox?

How to Install Firefox

Installing Firefox is not that tough as it seems. You just need to implement the below-mentioned steps to proceed with the reinstallation.

  • Open any reliable web browser. In the address bar, write “Mozilla Firefox Download”.
  • From the searched result, choose the latest version of Firefox.
  • Download it in the device. Now install the downloaded file.

Now. after reinstalling it in the device, check if you have solved the error. If not, then go to the next method to fix it at the earliest. But, before going to the next method, ensure that there are no Firefox files installed in the device.  

Method 2: Check SSL3 and TLS1 Encryption Protocols

Check SSL3 and TLS1 Encryption Protocols

If the SSL3 and TLS1 protocols are disabled in Firefox, there is a high chance of getting this error. Some of the websites need to connect with these two protocols mandatorily. So, if these protocols are disabled, you won’t be able to see the webpage. 

In that case, you need to first check if these protocols are enabled or not. For that, you need to implement this particular method. 

  • Open Firefox and tap on the “Settings” icon. Then go to the address bar.
  • In the address bar, write “about: config”. Hit the “Enter” button next.
  • Now, search for the “Advanced” option and click on it.
  • Thereafter, go to the “Encryption: Protocols” option.

Now, search for the TLS1 and SSL1 protocols. Then check if the protocols are enabled. If not, toggle the option to enable it.

Note: But if you use the latest version of Firefox, first, go to the “Options” form the Settings icon. Then from the “Privacy and Security” option, go to the “Security” option 

Next, make sure that the “Block dangerous and deceptive content” option is unchecked. Also, save the changes that you have recently made. So, restart the device after that and check if you have solved the Firefox error. If not, go to the next section to overcome this error.

Solution 3: Check Firefox Configuration

Check Firefox Configuration

If the configuration of Firefox is not correct, you can get this error. Hence, you need to enable the SSL3 and TLS, then set them as default protocols. 

Unless you enable it, the website can’t be accessed due to this specific error. Here, we will guide you on how to set these protocols in Firefox as default.

  • Open the Firefox and then go to the address bar. In the address bar, write “ TLS” and hit the “Enter’ button.
  • Now, check the entries that are starting with “TLS”. Make sure that the values of the TLS are set to “Default”. 

Note: If you don’t see the TLS status as “Default., then look for the border entry that will be stated as ”modified”.

  • After checking the status of TLS, write “SSL3” in the address bar and hit the “Enter” button.
  • Next, check if the status of the SSL3 protocol is set as” Default”.

Now, close the Firefox and check if you have solved the issue of SSL Error connection failure.