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You may encounter a variety of issues related to the browser on the web. So, if you are utilizing the Mozilla Firefox web browser, among those prospective problems is the SSL_ERROR_NO_CYPHER_OVERLAP. If you don’t know what is causing it, it can be frustrating and worrying.

You can take some straightforward actions to fix and also resolve this problem. However, getting a much better understanding of the factors behind this error will assist you in fixing it quickly.

In this blog, I will discuss the SSL_ERROR_NO_CYPHER_OVERLAP and what are its common reasons. I will explain how to fix it utilizing possible techniques.

Table of contents


– Possible Ways to fix the “SSL_ERROR_NO_CYPHER_OVERLAP” Error


Unlike other internet browser errors, the SSL_ERROR_NO_CYPHER_OVERLAP mistake happens, particularly with Firefox. However, Google Chrome also has a somewhat various yet similar version of it, with a different message “ERR_SSL_VERSION_OR_CIPHER_MISMATCH.”

Essentially, this error occurs when Firefox can not get the security data from any website you’re attempting to access. Usually, it occurs when the website you are trying to access is older and doesn’t have upgraded Secure Sockets Layer (SSL) protection.

SSL is the encryption in between your computer system and also a website’s web server. It suggests your web browser couldn’t connect in between them firmly if you come through this error message. It is necessary to note that an SSL certificate is like Transport Layer Protection (TLS), which will undoubtedly turn up once again in a moment.

However, if you need to understand the SEO importance of the SSL Certificate and its benefits, here is a complete guide.

Possible causes of the “SSL_ERROR_NO_CYPER_OVERLAP.”

Along with the error message, the Firefox browser will also display the “authenticity of the data can not be validated.” If so, the message might likewise suggest you call the site proprietor. Nevertheless, while the problem might result from the website, it might likewise be browser-related.

Much more significantly, there’s an opportunity that your Firefox version or among your specific browser setups is causing a miscommunication between website and your computer. One more prospective reason could be misconfigured or handicapped TLS or SSL3 settings.

Furthermore, your internet browser and the server must settle on the same file encryption cipher to connect. Unfortunately, few ciphers, including RC4, are no longer supported by popular web browsers due to their vulnerabilities. So, if the server you are trying to link uses an unsupported data encryption technique, you may see this error.

Most of the website users have reported experiencing this mistake after installing Cloudflare. It typically happens since the browser doesn’t sustain the Server Name Indication (SNI) method utilized by Cloudflare’s SSL certifications.

Best Ways to Fix the “SSL_ERROR_NO_CYPHER_OVERLAP” Error

Now that we recognize a little more concerning this problem, it is the right time to fix it. Here are potential services you can make use of to address the SSL_ERROR_NO_CYPHER_OVERLAP error message in Firefox.

1. Update Your Firefox Browser

The first and more straightforward fix for this particular error is to see you are using one of the most updated and recent versions of Firefox. To maintain your best experience as smoothly as possible, you need to keep your browser up-to-date. So, whenever you see the message given below then click on the restart to update button to enjoy the latest version of Firefox.

Auto Update Firefox Browser

To update your Firefox web browser to the latest version, open up the internet browser; if you are getting an update message, as you can view in the picture given above, then click on it and update it; otherwise, click on the menu icon, then browse to Help > About Firefox:

Go to Firefox options

Now, navigate to the about firefox as you can see in the picture given below:

Navigate to About firefox

The “About Firefox” option in the internet browser will check the updates and allows you to update. So, if there are any updates readily available, Firefox ought to immediately start downloading them:

The Firefox internet browser home window notifying the user that updates are downloading.

As soon as the download has been completed, click on the Restart button to Update Firefox.

Restart to update Firefox

Conversely, you can get the most recent version of the web browser from Firefox’s official website. Before downloading it, keep in mind to uninstall your current variation from your computer system.

To do so on Windows operating system, click the Windows + R key; after that, type “appwiz.cpl” in the search box and press enter button.

Run appwiz.cpl

Under the program manager, find Firefox, right-click on it, and proceed to Uninstall.

Uninstall FireFox

On macOS, click Go > Applications in the toolbar. Then, drag Mozilla Firefox to the garbage (or trash) to delete it.

2. Reset Your TLS and SSL3 Settings

The next step you will try if you are still facing the problem is resetting your TLS and SSL3 settings if you are using the newest Firefox version. Some internet sites require TLS and SSL3 protocols to make a connection. If you have disabled them, it might be the factor you’re seeing the “SSL_ERROR_NO_CIPHER” error.

To reset them, type “about: config” in the address (URL) bar. You will see a message “Proceed with Caution” that prevents you from mistakenly making vital adjustments to your web browser, so accept the risk and continue.

Firefox: Proceed with caution

This caution is Firefox’s method of preventing. Click on Accept the Threat as well as Remain to continue.

On the following Advanced Preferences screen, type “tls” in the search bar:

Typing this will undoubtedly produce a list of all your TLS setups:

Firefox about:config

Try to find any values that are bolded as they’re the ones that have changed recently. For any bolded values, right-click on them and choose Reset to restore them to the default setups.

Next, repeat the same procedure for SSL3. Write “ssl3” in the search bar, as well as reset any just recently altered value:

Also, make sure the following two items are set to false value:

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

Remember, blocking these settings is crucial for security purposes.

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3. Bypass Security Protocols & also Browser Configurations.

Generally, I don’t recommend you bypass browser safety and security protocols, as their function is to protect you from accessing hazardous internet sites. However, if you recognize the website you are trying to access a safe one, you may bypass this error manually by entering a cipher validation.

Click on the pencil (edit) icon and set this value to “0”. Next off, repeat the very same process for security.tls.version.fallback-limit.

Firefox About:config security.tls.version.min

To do so, you need to return to the about: config screen in your Firefox web browser. Once more, write “tls” right into the search bar. Choose security.tls.version.min from the listing:

A final way you can bypass security protocols is by altering your browser’s privacy settings. First, open your Firefox menu; after that, browse to Options> Privacy & Protection:

Under the Security area, deselect “Block dangerous and deceptive content”:

Firefox Block dangerous and deceptive content

You have efficiently fixed the error; otherwise, it can be a server-side issue. Usually, this occurs when a website is using the RC4-only cipher collection.

Some ciphers, consisting of RC4, are no more sustained by significant web browsers due to susceptibilities. You can run an SSL check to confirm that your SSL certification is not utilizing outdated ciphers.

The only point left to do is contact the website owner to make sure they recognize the problem if you’re not the site owner.

Final Words

Being rejected access to a site you’re trying to access is never fun. It can be incredibly irritating when the error message is as confusing as the SSL_ERROR_NO_CYPHER_OVERLAP error. You can take some straightforward actions to settle this Firefox-related issue:

– Update your Firefox web browser

– Reset your TLS and SSL3 setups.

– Bypass security protocols & browser configurations.

Do you have any questions regarding fixing this error? Allow us to know in the comments section below!

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