By Ryan Gardner
 on September 6, 2021
Last modified on January 7th, 2022


By Ryan Gardner
 on September 6, 2021
Last modified on January 7th, 2022

I still have Firefox on my laptop, but it is no longer my go-to browser. I still fire it up from time to time since some blog links are saved on that particular browser. Some browsers work better for particular sites as well.

Sometimes, I have noticed an error that says “SSL Error No Cypher Overlap” after attempting to view a website. If you have ever used Firefox, you may have encountered this error at times as well - especially if you have not been to a site in a while. 

If you are a Mozilla Firefox user and want to know “What is SSL error no cypher overlap?”, continue reading so you will be able to troubleshoot the problem.

white and silver electronic device

What is SSL Error No Cypher Overlap?

When we load a website, our servers go through different steps to make a connection. Instead of seeing an (HTTP://), you may see an( HTTPS://). HTTPS usually indicates that a website is extra secure. 

Such sites conduct functions to make sure the SSL/TLS and certificate connection is valid. The SSL certificate is checked against the certifying authority. The certificate is also decrypted during this attempt to connect. However, Mozilla will prevent access to the website if an issue is detected at this time. That is when you may see an “SSL_ERROR_NO_CYPHER_OVERLAP” error instead of the latest update on your favorite blog or website.

What is SSL?

SSL is a safety protocol that stands for Secure Sockets Layer. SSL protocols are present across all internet services, including social media. It protects your IP address from being intercepted by hackers. It also works in cohesion with Transport Layer Security (TLS).

SSL protects the web content, IP address and enables a secure connection. Thanks to SSL protection, you can stop hackers from impersonating your website or stealing your personal information. 

The SSL Certificate is a seal of approval for online security. This is a digital document that proves the encrypted data stream is owned by the website in question. In other words, It serves as an ID card and authentication key for a website. 

Have you ever wondered why that little key icon displays in the top-right corner of some websites? Well, now you know that the icon is to alert you and other web surfers that you are on a secure website. The key is an indicator of SSL certificate protection.

How Do I Fix SSL Error No Cypher Overlap?

Check For Browser Updates

The first thing to do is to check that you have the latest and most secure version of Mozilla Firefox. You can do a manual update with the following steps:

  • Open Firefox
  • Click the Firefox menu button
  • Select About Firefox from the menu
  • The About Firefox window will open
  • Download the latest version

Be Patient

It may be best to wait 24 hours to see if your SSL certificate has been deployed properly. This is a timing issue in most cases. Double-check if you have an active certificate by way of the SSL/TLS app section in Cloudflare, but if it is still processing, you will see “ Initializing Certificate”.

Restart SSL Deployment

Go to the Cloudflare dashboard and navigate to the SSL/TLS app. Then select Disable Universal SSL. Hit the Enable Universal SSL button after a few minutes.

Take a Break From Cloudflare

Use the origin’s SSL certificate by pausing Cloudflare. Go to the Cloudflare dashboard and click Overview. Navigate to Advanced Actions and click Pause Cloudflare on Site.

Once you reactivate Cloudflare, wait 24 hours and check if the SSL certificate has been deployed on your website.

Final Note About SSL Error No Cypher Overlap

This article should now give you a good overview of how to handle “SSL Error No Cypher Overlap.” errors. You should now understand the importance of SSL and how the protocol protects both web surfers and website owners.

If you use Mozilla Firefox, keep your browser updated to avoid this error on the user's end.

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Article By
Ryan Gardner
Ryan is a developer at Isotropic Design, and publishes detailed thoughts, analysis, and comparisons on the Isotropic Blog.
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