1 Star2 Stars3 Stars4 Stars5 Stars (1 votes, average: 5.00 out of 5)

A Step-by-Step Guide to Solve the SSL_ERROR_RX_RECORD_TOO_LONG Error on Mozilla Firefox

While browsing the internet frequently looking to get information, you might encounter one of the most standard errors such as this SSL_ERROR_RX_RECORD_TOO_LONG. It’s important that you know how to resolve this error so that you can get back on track.

Before we look at how we can solve this error, you should first understand what this error means and how it gets triggered. In this article, we’ll have a closer look at what this error is and simple steps to resolve the same.

See Also: How to fix SSL_ERROR_NO_CYPHER_OVERLAP Error?

How to Fix the “SSL_ERROR_RX_RECORD_TOO_LONG” error?

There are seven methods you can use to resolve the “SSL_ERROR_RX_RECORD_TOO_LONG” error:

  1. Clear Browser History and Cache
  2. Update and Reset
  3. Disable Your Browser Extensions
  4. Use the HTTP Protocol
  5. Update Your Proxy Settings
  6. Change Your TLS Preferences
  7. Trusted Sites List

1. Clear Browser History and Cache

The most straightforward way to solve this problem is by clearing your Browser’s cache and history. You can also start by removing your browser’s cache cookies by following these steps:

  • Open your Mozilla Firefox browser & click on the hamburger menu icon (Top-right corner of the screen’s three vertical lines).
  • Next, click on Settings, followed by the Privacy & Security tab.
Privacy and Security Option
  • Now, click on the Cookies and Site Data section, and select Clear Data.
  • This will open a new window to clear data.
Clear Data Cookies
  • Select all the shown options and click on the clear button
  • The last thing to take care of is to clear the history. You’ll be able to view the option on the same page.

Once you’ve performed this step, close the browser and reopen it. If you still face the same error, try out other solutions.

2. Update and Reset

Updating and restarting your Firefox browser may help you fix the “SSL_ERROR_RX_RECORD_TOO_LONG” error.

You can do this by returning to the menu icon, choosing Help, and then choosing About Firefox:

About Firefox Update
  • This will open a new window where you can update Firefox and restart.
  • For surety, restart your computer, then reopen your browser after it’s finished and try accessing the website again.

If you are still facing the same problem, it may be a problem related to the extension. In that case, you should follow the next step.

3. Disable Your Browser Extensions

A considerable number of browser extensions can also affect the browser’s speed. You could also potentially face common problems similar to “SSL_ERROR_RX_RECORD_TOO_LONG”.

Extension disabling is essential while using ad blockers, firewalls, or antivirus extensions.

It is crucial to remember that permanently shutting off any of these programs is not advised. However, temporarily turning off these tools can assist you in identifying whether they’re the cause of the issue and, if so, determining a workaround. To do so:

  • Go to the menu, choose Add-ons and Themes
  • Then click on the Extensions tab to disable your Firefox extensions
Manage Firefox Extensions
  • Toggle the switches here to turn off each extension. (You may prefer a straightforward method if you have many and can accomplish this by starting Firefox in Safe Mode.)
  • For the same, go to the menu and click on Help.
  • After that, select Restart with Add-ons deactivated. Restarting the browser while in troubleshooting mode is another option.
  • Choose one of these, and a dialogue box will appear. Simply select Restart.

If the error “SSL_ERROR_RX_RECORD_TOO_LONG” still shows, try visiting the website that is returning it. If the extension disabling and restarting are not working, try the below methods.

4. Use the HTTP Protocol

This method is more straightforward. The website URL starts with “https://”, but sometimes the site you visit may not support this protocol, so try revisiting the website by changing the beginning to “http://” protocol.

After removing “s” or rewriting the URL without “s”, just press the enter button to load the site, and you are good to go.

5. Update Your Proxy Settings

You may also see this warning because your proxy settings are incorrect. Disabling your proxy settings is the first thing you should do to check if the issues occur due to it. By choosing Settings from the Firefox menu, you can accomplish this task.

  • Choose Settings from the Network Settings menu at the bottom of the screen.
Network Settings Option
  • Choose the first option in the window that says “No proxy“:
No Proxy Option
  • Lastly, press the OK button.

Check whether the problem has been fixed by restarting the browser. If not, try the next one to see if it is causing the error.

6. Change Your TLS Preferences

This error can result from your TLS settings, as we previously explained. Thus, changing your options can help you resolve it for good. For instance, Firefox thinks that the website supports TLS 1.3 even though your Operating System, on which Mozilla Firefox is running, does not.

And due to that this SSL_ERROR_RX_RECORD_TOO_LONG error may appear. Hence, if you’re running Microsoft Windows and wish to stop supporting TLS 1.3, follow the instructions below temporarily.

  • Open a new tab in Mozilla Firefox and type “about:config” in the address box.
  • Next, click the “Accept the Risk and Continue!” button.
About Config Option
  • Type security.tls.version.max into the search box, and double-click on the result.
  • A pop-up will appear, allowing you to switch the value from 4 to 3.
Security TLS Version Max Option

After completing the steps, try revisiting the website by restarting the browser. If you still face the same problem, then look for the last resolution for this error.

Note: Firefox values support the TLS version wherein 1 stands for TLS 1.0, 2 for TLS 1.3, and 3 for TLS 1.2. Versions lower than TLS 1.2 are not supported owing to security vulnerabilities.

7. Trusted Sites List

You can also add the site you are experiencing the error with to your trusted list to fix Firefox’s SSL_ERROR_RX_RECORD_TOO_LONG. We’ll look at how to resolve this issue using Windows.

  • Start by entering Internet Options into your Windows menu’s search bar:
  • Click the Security tab and Trusted Sites in the Internet Properties window that appears.
Trusted Sites Option
  • Click on the Sites button.
  • In the next window enter the URL of the website displaying the error message.
  • When finished, select Add > Close. Lastly, click OK after selecting Apply.

By performing this step, all the browsers will trust the sites you visit and eliminate the error.


This error is specific to the Mozilla Firefox browser, which means you won’t face it while using other browsers, but may encounter similar errors.

The specific warning may vary depending on the browser in use. But the message “Secure Connection Failed” will show up along with “SSL_ERROR_RX_RECORD_TOO_LONG”.

Since it is one of the common types of error, we can employ many techniques to resolve it. But before diving into the mud of troubleshooting, let’s look at the cause of the error.

What Causes the “SSL_ERROR_RX_RECORD_TOO_LONG” Error

As seen above, the error mainly occurs since the authenticity of the received data could not be verified.” Establishing a secure connection may not be possible, and there may be problems with the website’s SSL certificate.

This error message could be caused by a lack of security on the website you’re attempting to access, whether it’s your own or someone else’s. In a nutshell, the SSL certificate’s improper configuration is the most frequent cause, which prevents your browser from successfully establishing a connection with the server’s port.

Also, you might have an improperly configured listing port, which is one of the potential causes. Another cause might be that the appropriate version of Transport Layer Security is not supported by your browser (TLS). It used to be a widespread problem with TLS 1.2, but in recent years, it is also happening with TLS 1.3.


Seeing errors like SSL_ERROR_RX_RECORD_TOO_LONG can be annoying when accessing a website. However, this particular error is linked to Firefox browsers and there are some straightforward ways to fix this error message as mentioned above.

Try clearing your cache, restarting your browser, upgrading your proxy settings, and adjusting your TLS preferences in addition to other steps. Contacting the site’s owner may be a good option if you require additional assistance for troubleshooting this or similar problems.

Additionally, you can contact the SSL experts at the SSLWiki.org for resolving the same or similar problems.

Recent Posts

Explore More Topic