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How to fix SSL_Error_No_Cypher_Overlap?

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SSL certificates are a must for you to show on the internet that your site is safe. However, implementing an SSL certificate doesn’t always go smoothly, and there are random bugs and errors that you can run into at times.

In this article, we’re talking about the ‘SSL_ERROR_NO_CYPHER_OVERLAP’ error, its causes and what you can do to fix the error.

What causes this error?

The error is specific to Firefox and is caused when the browser cannot pull the required security verification data from the target website. This causes the SSL certificate not to load essentially making it seem like the site doesn’t have one. 

Also read: How to fix SSL_error_rx_record_too_long in Firefox?

How to fix this?

Here are four fixes you can try out. 

Update Firefox

Updating your browser to the latest version available can also help resolve any security issues. To update Firefox, head to the Settings page, scroll down to the Firefox Updates section and check for any available updates. 

How to fix SSL_error_rx_record_too_long in Firefox?

If any updates are available, install them, restart the browser and try again. 

Update your TLS version

If your web server is using an older version of TLS, you need to upgrade your TLS/SSL library to support the latest standard. While your hosting provider should automatically implement this, in case you see the error, updating the library manually shouldn’t be too much of a hassle.

You will need to contact your hosting provider for the exact steps. 

Check SSL and TLS protocols

Firefox not enabling the SSL3 and TSL1 protocols by default can also cause this error as the browser would then not be able to recognise older certificates. Here’s how you can enable them,

Step 1: Open Firefox and type about:config in the URL bar. Once the page loads, type in tls in the search bar to bring up all TLS-related configurations.

Step 2: Look for any configurations in bold as they’re the ones changed from their default values, and click the reset icon at the far right. 

Step 3: Now repeat the process for SSL-related configurations by searching for ssl3 to bring up any configurations you might need to fix. 

Once done, restart your browser, and you should be good to go. 

Bypass Firefox encryption protocols

Finally, you can bypass Firefox’s encryption protocols to get to the site you want. Do remember that it’s not recommended to do this as it’ll open you to risks from unknown and potentially malicious websites. 

All you have to do is open Firefox and head to about:preferences#privacy. Once on the page, uncheck the Block dangerous and deceptive content setting under Security. 

Also read: How to fix error: transport error 202: bind failed: address already in use?


Yadullah Abidi

Yadullah is a Computer Science graduate who writes/edits/shoots/codes all things cybersecurity, gaming, and tech hardware. When he's not, he streams himself racing virtual cars. He's been writing and reporting on tech and cybersecurity with websites like Candid.Technology and MakeUseOf since 2018. You can contact him here: