▷ How to fix SSL_ERROR_NO_CYPHER_OVERLAP in Firefox

The error code $ 0027 SSL_NO_CYPHER_OVERLAP $ 0027 occurs in Firefox when a certain type of encryption has been disabled in the browser or on the server. In most cases, the problem lies with the website or the server that does not provide the proper encryption protocols and forces the browser not to open the website.

SSL_NO_CYPHER_OVERLAP – Mozilla

This error can occur while browsing any website, although it is more visible in those that are outdated and not properly maintained. To correct this error, exist “Some” remedies, but keep in mind that the latest versions of Firefox always reinforce a good security connection and, if not provided, the website is blocked from accessing the browser.

What causes the error code “SSL_ERROR_NO_CYPHER_OVERLAP”?

As it was mentioned already, this error code occurs when, In most cases, the server does not provide the appropriate security mechanisms or protocols to the browser's request, so the web page does not load. However, there are also other reasons such as:

• Firefox is not updated to the latest version, what causes problems when browsing the Internet.

• SSL3 is disabled in the web browser. What's more, TLS can also be disabled, what causes the error message.

• RC4 support has been completely removed from Firefox and if the website passes it as a parameter, this error will be requested.

Before moving on to solutions, make sure you have administrator privileges and have a stable internet connection.

Solution 1: update Firefox to the latest version

Firefox is updated and new security and protocol modifications are added all the time for a more secure and improved experience. If you have an older version of Firefox like SP2 or SP3, you need to navigate to the official Firefox website and download the latest version, namely, 24.

Firefox installation – Windows

You can uninstall the current version of Firefox by pressing Windows + R, typing »appwiz.cpl» in the dialog box and hitting Enter. Once in the program manager, right click on Firefox and select Uninstall.

After uninstalling the previous version, download the latest version and restart your computer for the changes to take place properly. What's more, make sure to remove the config files when uninstalling the old one.

Solution 2: check SSL3 and TLS1 encryption protocols

Users will also experience this error if the SSL3 and TLS1 encryption protocols are disabled in their version of Firefox.. Some websites require these mandatory protocols for their connection and, if you have them disabled, you will not be able to see the web page.

We will check the options in Firefox and make sure they are enabled as expected.

1. Click the settings icon in the upper right of the window and select

1. Now navigate to Advanced> Encryption: Protocols Choices: Firefox

Here you will know if the protocols are enabled or not. If that is not the case, change option and enable them again. However, note that the option to perform this action will not be available in Firefox 24. If you already have the latest version of Firefox, you can navigate to Options> Privacy & Security> Safety. Here, uncheck Block dangerous and misleading content option. Save the changes and restart your computer. Check if the error message has been resolved.

Solution 3: check the Firefox configuration file

If the above two methods don't work for you, we can try to check your Firefox configuration and check if any TLS and SSL3 module is disabled. If so, we will try to activate it and retry to access the website. These modules can be changed in your operations all the time, so there is nothing to worry about.

1. Open a new window in Firefox and paste the following address:

on:config

1. Now search for the keyword “TLS” in the search bar at the top, check each entry that starts with TLS if they are configured with a default value. If that is not the case, you will see a bolder entry which will also be tagged as modified.

TLS y SSL3 – Mozilla Firefox

1. In this case, reset the necessary permissions and restart your computer. In the same search box, I searched “SSL3” and do the same.

Note: If you cannot access specific websites but can access other websites, it probably means the website is out of date and the problem is with the server. Here you can only hope the problem is resolved on the server. What's more, make sure you have the latest version of java.