Home Technology How to Fix SSL_ERROR_NO_CYPHER_OVERLAP On Firefox


Imagine you are in the middle of some work and suddenly a message pops up saying- “error code ‘SSL_NO_CYPHER_OVERLAP’ in your Firefox browser. Irritating, right? How to Fix SSL_ERROR_NO_CYPHER_OVERLAP on Firefox The first thing that comes to mind after this must be – Why this error occurred? How to fix this error code as quickly as possible?

Well, if we are right then let me make one thing clear, you are in the right place. From many forums and experts, it’s been said that this error occurs when some necessary encryption get disabled in your Firefox browser.


Is your computer having some issue that causes this error?

 No, the problem doesn’t lie in your computer, mostly it’s in the server or on the website which does not provide a proper encryption protocol. In some cases, the error also occurs when the server protocols restrict and forces the Firefox browser not to open a website. How to Fix SSL_ERROR_NO_CYPHER_OVERLAP on Firefox

Is it sufficient to know why is an error occurs? And what are the proven methods to fix this out? Everything that you should know about this error code SSL error no cypher overlap just goes through the complete read.

What Are The Cause Of The SSL_ERROR_NO_CYPHER_OVERLAP Firefox Error?

Like other errors, it also occurs all of a sudden without any prior hint while surfing any website. The major reason for this error said to be an outdated Firefox browser version.

Also, if your Firefox browser is not maintained properly with clear caches then it might also be the reason for this error. Furthermore, this error code can also occur in case your browser didn’t receive the requested protocols or security mechanism from the server properly. That’s All? No, there are some other reason also which might cause this error, some of it is-

  • If your Firefox browser is with disabled SSL3.
  • In case you disable the TLS, then this may also result in causing this error.
  • If the RC4 support from your Firefox browser is completely removed.

Well, this all about why this error occurs or what are the main reason which ends up causing this error code ‘SSL_NO_CYPHER_OVERLAP’, but What after this? What are the various methods to fix this? Here they are.

Hold On! Before moving to get familiar with all proven methods to fix this make sure you have a proper and stable internet connection and all administrator privileges.



Not one there is a total of three well-known and verified methods to fix this error code ‘SSL_NO_CYPHER_OVERLAP’.

Don’t pick a method and start implementing, go in the way we have arranged it because we have listed them in the order of their success rate. How to Fix SSL_ERROR_NO_CYPHER_OVERLAP on Firefox

Note- Firefox block the website from opening if it disobeys the browser security protocols in any way.  

Here we start with-

Fix 1: Update your Firefox Browser To the Latest Version i.e. 24

To fix this error code you must update your Firefox browser. This because Firefox keeps on updating their browser on a regular basis for improved experience and new security modifications along with mandatory changes in protocols.

How to check you are having the latest or outdated Firefox? Simple, if your Firefox shows any of this version- SP2 or SP3, you need to update your browser to 24. How to Fix SSL_ERROR_NO_CYPHER_OVERLAP on Firefox

How to update your Firefox browser? For this there are few steps that you should have to follow, these are-

Step 1. First, download the latest version of the Firefox browser from their official website.

Step 2. After downloading uninstall the current Firefox version from your computer.

Now, you might think of how to uninstall, just go through these steps-

1. Simply press Windows + R.

        2. After this you will notice a dialogue box enter “appwiz.cpl” in it.

        3. You will notice the program manager on your screen after pressing the enter button.

      4. Lastly, right-click on the Firefox icon and choose Uninstall.

After uninstalling, install the previously download the latest version.

Note-  While uninstalling the outdated version make sure you delete the configuration files too.

Fix 2: Check TLS1 and SSL3 Encryption Protocols Disability-

It has been confirmed from various community forums that many users have to face this error if their Firefox browser encryption protocols TLS1 and SSL3 are disabled. This because there are many websites that need these encryption protocols enabled for their server connection to connect with your browser, and disabling them might restrict the webpage to load.

How to check whether you have disabled these protocols? It’s quite simple, you just need to check the ‘Options’ column in your Firefox and turn it on if not.

Need a stepwise process? Don’t Worry! Here it is-

Step 1. First, click on the Settings icon present at the right corner of our Firefox window.

Step 2. Now, choose the Advanced option from the opened menu.

Step 3. After this choose the Encryption: Protocols.


Step 4. Check whether the protocol is enabled or disabled, change it to enable the mode if in disable mode.

Done? Yes, isn’t it so simple? Now, have a look at the last method to fix this error.

Fix 3: Check the Firefox Configuration Files-

This is the last method to fix this error and apply this if the above two didn’t help you out.

You need to check the Firefox browser configuration files if your TLS and SSL3 module’s encryption protocols were in disabled mode. How to Fix SSL_ERROR_NO_CYPHER_OVERLAP on Firefox

Check the modules carefully and if found disabled, just make them enable and once again try to access the website being restricted by your Firefox browser.

The thing for which you don’t have to worry about is that you can change the configuration anytime as per your need.

Now, the question arises- How to Change the Configuration Files? This is too very simple, just go through the following steps mentioned below-

Step 1. First, open a fresh window in your Firefox browser.

Step 2. Now after opening just paste the following address: about:config

Step 3. After this a configuration page will open, just search ‘TLS’ using the search bar.

Step 4. Now, the keyword will help you in checking each configuration file starting with TLS.

Step 5. If they are not set to a default value change it to default and repeat the same process in the case of SSL3.

That’s it. This is all we about the various and proven methods to fix this error code ‘SSL_NO_CYPHER_OVERLAP’

Final Words

Technology brings convenience, however, as rightly said, ‘nothing is perfect’. Hence, errors is a part of parcel of technology. Having said, fixing the error can be easy and quick if we understand the root cause and keep the steps handy.

Hope we helped you out fixing your Firefox error code ‘SSL_NO_CYPHER_OVERLAP’ by listing all known and proven methods to do this. Covering everything related to this error including its actual cause and basic reason with their best fixes.

If you have any other method to fix this error code, just let us know in the comments below.


Bidisha Dey
Hello, I am an SEO expert and digital marketer, with more than 3 years of experience.


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