• Categories
    • Coding
    • Design
    • Inspiration
    • News
    • WP Plugins
    • WP Themes
  • Start Here
    • How to Start a Blog
    • Make A Website
    • WordPress Hosting
  • Freebies
  • Deals
    • WPEngine Coupon
    • WPX Coupon
    • Elegant Themes Coupon
    • Learndash Coupon
    • View All Deals
  • Glossary
How to Fix the SSL_ERROR_NO_CYPHER_OVERLAP In Firefox

By Tom April 29, 2022

How to Fix the SSL_ERROR_NO_CYPHER_OVERLAP In Firefox

You’ll see the SSL_ERROR_NO_CYPHER_OVERLAP in Firefox if it can’t get the required security data from a website. While this is often because a site won’t have a current Secure Sockets Layer (SSL) certificate, you may also find this is due to a miscommunication between browser and server.

If your browser’s TLS and SSL settings don’t align with what the server expects, you’ll see the SSL_ERROR_NO_CYPHER_OVERLAP. As such, there are two ways you can fix this:

  1. Reset your TLS and SSL settings
  2. Carry out a temporary bypass of your browser’s configuration settings.

Note that we’re not going to cover some super basic fixes here. For example, you won’t find information on making sure you update your browser, or deactivating your firewall and anti-virus software. These should be second nature, and we’d recommend you tackle the below steps with a current version of your browser, with no other software able to impact your session.

1. Reset Your TLS and SSL Settings

Most secure websites require accurate, current, and active TLS and SSL3 connections in order for the net to work. If the browser falters here, you’ll see the SSL_ERROR_NO_CYPHER_OVERLAP in Firefox.

To resolve this, you’ll need to access Firefox’s browser configuration settings. You’ll do this through using about:config within the address bar:

A warning ahead of accessing the about:config screen.

In most situations, this will show you a warning: “Proceed With Caution” will be the most common, but it could display other variations. Regardless, this is Firefox’s way to tell you that whatever you do here could introduce problems. However, you can click Accept the Risk and Continue, which will bring you to a preferences screen:

A blank about:config screen.

On this screen, use the search bar to filter entries for “tls”:

The about:config screen showing a list of TLS security settings.

Also, do the same for “ssl3”:

The about:config screen showing a list of SSL3 security settings.

For both of these searches, you’ll want to reset any bold values. This ‘bolding’ denotes a recent change that you need to be aware of.

While you’re here, you’ll also want to make sure two entries only show as “false”:

  • security.ssl3.dhe_rsa_aes_128_sha
  • security.ssl3.dhe_rsa_aes_256_sha

These shouldn’t need your input, but know that they are essential security settings. If they don’t have a false value, you’ll need to make sure they do in order to fix the SSL_ERROR_NO_CYPHER_OVERLAP in Firefox.

2. Bypass Your Browser Configuration and Security

For the majority of cases, you’ll either deal with an unsecure website, or a change in your browser settings. However, you may want to bypass some of your security settings to make sure that you don’t have an issue.

Note that we don’t recommend this step as a permanent fix. Your browser’s security configurations help protect you and your data from malicious intent. As such, you’ll want to revert things back once you carry out a test, and seek out a permanent resolution to the SSL_ERROR_NO_CYPHER_OVERLAP in Firefox.

Regardless, you’ll need to head back to the about:config screen in Firefox. This time, search for the security.tls.version.min entry:

The about:config screen, showing a number of TLS security version settings.

Here, enter a zero (0) value using the pencil icon, and click the tick icon to save your changes. This should resolve the SSL_ERROR_NO_CYPHER_OVERLAP in Firefox, but you can also enter into your browser’s general settings pane:

The Settings link within Firefox's hamburger menu.

Under the Privacy & Security pane, scroll to the Security section, and look for the Block dangerous and deceptive content option:

The Privacy & Security screen in Firefox.

If you untick this, you’ll bypass your browser’s encryption protocols, which will let you see if you can fix the SSL_ERROR_NO_CYPHER_OVERLAP in Firefox.

In Summary

The SSL_ERROR_NO_CYPHER_OVERLAP in Firefox – sometimes the ERR_SSL_VERSION_OR_CIPHER_MISMATCH error in Google Chrome – can stump you. However, the fix is often straightforward. In lots of cases, the issue relates to an old SSL certificate on a site. Even so, it’s a good idea to check over your browser’s TLS and SSL settings to see if this will resolve the issue.

While we talk about bypassing your browser’s security configurations, it’s not a recommended step. It’s good for a temporary resolution, but you’ll want to find a more permanent fix over the longer term.

Do you have any questions about the SSL_ERROR_NO_CYPHER_OVERLAP in Firefox? Ask away in the comments section below!

Related Posts

Reader Interactions

Droppin' design bombs every week!  5,751 subscriber so far!

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

*

*

Primary Sidebar

Useful Guides

What is WordPress?
How To Make A Website – Step by Step Beginner’s Guide
9 Best WordPress Hosting Compared (March 2023)
8 Best Backup WordPress Plugins Compared – 2023
14 Ways to Secure Your WordPress Site – Step by Step
Top 9 Email List Building Plugins for WordPress Compared (2023)
Build Your Tribe: 6 Top WordPress Membership Plugins Compared for 2023
11 Best Website Builders of 2022: Wix, Squarespace, Weebly, & More
8 Best WordPress Contact Form Plugins for 2023
How to Use Facebook Debugger and Open Graph to Fix Posting Issues
Top 10 Free Website Speed Test Tools for 2023
5 Top WordPress Landing Page Plugins Compared (2023)
5 Best WordPress Learning Management Systems (LMS) Plugins Compared – 2022
20 Best Google Fonts & How To Use Them
7 of the Best FTP Clients for Mac & Windows
11 Dropbox Alternatives to Securely Store Your Files in the Cloud
25 of the Useful and Best Brackets Extensions
What is Loremp Ispum? 18 Plain & Hysterical Lorem Ipsum Generators for 2023
How to Clear Browser Cache (Google Chrome, Firefox, Safari, Opera, Microsoft Edge, & Internet Explorer)
6 Best Managed WordPress Hosting Options for 2023

Latest Deals

  • Elegant Themes: 20% OFF on the best drag & drop theme & plugin
  • WPEngine Coupon: Get 20% off the best Managed WP Hosting
  • WPX Coupon: Get up to 50% off on one of the best hosting providers
  • Inmotion Coupon: 47% off + Free Domain on Inmotion hostnig
  • View More Deals  

Categories

  • Adobe Photoshop14
  • Coding18
  • Design36
  • Fonts26
  • Freebies3
  • Inspiration52
  • News6
  • Resources58
  • Showcase7
  • Tutorials6
  • WordPress Plugins29
  • WordPress Themes28
  • WordPress Tutorials27
  • WP Hosting11

DesignBombs content is free, which means that if you click on some of our referral links, we may earn a small commission. Learn more!

Home About WordPress Hosting FTC Disclosure Privacy Policy Contact

© 2008-2023 All Rights Reserved.