You are currently viewing How to Fix the “SSL_ERROR_NO_CYPHER_OVERLAP” Error


Firefox is a great option if you don’t want to use Google Chrome, and it has many cool things you can do. If Chrome is causing you trouble, you can switch to using Firefox. Sometimes, when you’re using Firefox, you might see an error called SSL_ERROR_NO_CYPHER_OVERLAP. This can be annoying because you might not know why it’s happening. Usually, when this error pops up, it means there’s a problem with how your browser is keeping your information safe with something called SSL protection.

What is ssl_error_no_cypher_overlap?

Sometimes, when you’re trying to open a website and your browser can’t get the security information it needs, you might see an error message like “ssl_error_no_cypher_overlap.” This happens because the people who own the website use SSL certificates to keep the information you share with the website safe.

When you send or receive information on the internet, it’s like speaking in a secret code that only your computer and the website’s computer can understand. This code is called ciphertext. The SSL certificate acts like a key to unlock this secret code. But, if there’s a problem and the certificate can’t create a secure connection, you’ll see the “ssl_error_no_cypher_overlap” error. It means there’s an issue with the details of the certificate and the key needed to unlock the code.

This particular error shows up only in the Mozilla Firefox browser. Other browsers, like Google Chrome, show a slightly different message, saying “ERR_SSL_VERSION_OR_CIPHER_MISMATCH.”

SSL is essential for making sure a website is safe and verifying who you are online. The error happens when your browser can’t get the right security information from the website it’s trying to connect to.

There could be many reasons why this happens.

What’s the Reason Behind the Error Code ‘SSL_ERROR_NO_CYPHER_OVERLAP’?

The SSL_ERROR_NO_CYPHER_OVERLAP problem happens only in Mozilla Firefox. Basically, this issue comes up when Firefox can’t get the right security info from the website you want to visit. Because of this, the website won’t load, and you’ll see the cloudflare SSL_ERROR_NO_CYPHER_OVERLAP error code. If you’re using an old version of Firefox, it can lead to this error. Also, if the SSL3 or TLS is turned off in your browser, that could be another reason for this error.


The “SSL_ERROR_NO_CYPHER_OVERLAP” error can be fixed in three ways:

Keep your Browser Updated for Safer Browsing

Just like Chrome and other big browsers, Firefox also gets updates now and then. These updates bring in new features and safety measures to make your online experience more secure.

If you ever see the “SSL_ERROR_NO_CYPHER_OVERLAP” error, start by checking if your browser is up to date.

If you’re using SP2 or SP3 versions of Firefox, make sure to get the latest one from the official Firefox website. Make it a habit to check for updates regularly.

To update Firefox, click on the three-bar icon on your browser, go to Help, and then click on About Firefox.

Once you’re there, Firefox will start downloading any available updates. After it’s done, click on “Restart to Update Firefox.”

If you want to download the newest Firefox from their website, first uninstall the older version. Press Windows+R, type “appwiz.cpl,” and hit Enter. Find Firefox, right-click, and choose Uninstall. Then, download the latest version from the official website and restart your computer to enjoy the updated browser.

Check SSL and TLS Encryption Protocols

This error might also be because SSL3 and TLS1 protocols are turned off in older Firefox versions. While some websites don’t need these protocols, others won’t work without them. You can check and enable these protocols in Firefox Options.

  • Click on Settings at the top right, go to Advanced > Encryption: Protocols.

Here, you can see if the protocols are enabled. If not, enable them.

For the latest Firefox version, go to Options > Privacy and Security > Security. Find “Block dangerous and deceptive content,” uncheck it, save changes, restart your device, and see if you can access the website.

Check Browser Configuration File

Sometimes, this error happens because TLS and SSL3 modules are changed. You can check your Firefox settings to make sure everything is in order.

  1. In a new Firefox window, type about:config.
  2. Search for “TLS” and check if any entries starting with TLS are modified. If yes, reset them.
  3. Do the same for “SSL3” and restart your system.

Now, you should be able to access the website. If not, the problem might be on the website’s end, and you’ll have to wait for the website admin to fix it.

Get SSL Certificate and SSL Support

If you’re looking for a SSL certificate for your website, you can visit Lease Packet and get one from there. We provide SSL certification to all websites to enhance user trust and data safety. 

If you’re facing issues with your SSL certificate, you can contact experts at Supportfly. Certified experts will help you resolve all your server related issues instantly.


If you see the “SSL_ERROR_NO_CYPHER_OVERLAP” error, you can follow the steps mentioned above to try and fix it. Even after updating Firefox and adjusting TLS and SSL settings, if you still can’t get into the website, there’s not much you can do. It might be a problem with the website itself. In that case, you can only access the website again when the person in charge of the site fixes the issue.


Q1. How to Fix ssl_error_no_cypher_overlap Error code in Firefox?

Update Firefox to the latest version.
Check SSL and TLS settings in Firefox Options.
If the error persists, it might be a problem with the website itself.

Q2. What Does Error Code ssl_error_no_cypher_overlap Mean?

This error happens when your browser can’t securely connect to a website due to issues with the SSL/TLS settings or the website’s security certificate.

Q3. How to Bypass ssl_error_no_cypher_overlap?

It’s not recommended to bypass SSL errors, as it compromises your online security. Instead, try the mentioned fixes to resolve the issue.

Q4. How to Bypass Secure Connection Failed in Firefox?

Avoid bypassing secure connection errors, as it puts your data at risk. Fix the issue by updating Firefox and checking SSL/TLS settings.

Q5. How to Fix TLS Certificate Error?

Update your browser to the latest version.
Check TLS settings in your browser’s options.
If the error persists, it may be a problem with the website’s security.