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How to fix SSL_ERROR_RX_RECORD_TOO_LONG on Mozilla Firefox ?

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  • Last Updated : 05 Nov, 2020
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What Is the Mozilla Firefox Error Message SSL_ERROR_RX_RECORD_TOO_LONG ?

Firefox SSL_ERROR_RX_RECORD_TOO_LONG message is displayed because a certain mis-configuration has been occurred on the server. Most of the time, because of the following two reasons, the SSL_ERROR_RX_RECORD_TOO_LONG error message is displayed from the server-side:

  • The listening port is misconfigured. For example, the website you may want to establish a secure connection is not configured to use Port 443.
  • Adequate TLS version may not be supported by your system.

Mostly, SSL_ERROR_RX_RECORD_TOO_LONG may occur due to any one of the issues mentioned above. Now let’s learn how to fix this issue.

Upgrade Your Support for TLS Version: TLS 1.3, called as RFC 8446, is the latest TLS version. So, check whether the SSL/TLS library is updated or not. Most systems and servers use the Open SSL library, which will support TLS 1.3. If due to any reason, your system or server cannot support TLS 1.3, then make sure that it supports for TLS 1.2 is available.

To Solve the SSL_ERROR_RX_RECORD_TOO_LONG, use the Correct Listening Port: As mentioned above, 443 is the correct listening port for HTTPS traffic. If your port doesn’t match or the trusted SSL/TLS certificate is not on that port, it’s likely you’ll face this SSL_ERROR_RX_RECORD_TOO_LONG error message.

Fixing the SSL_ERROR_RX_RECORD_TOO_LONG From a User’s Standpoint: Let’s see a user what you can do to solve this Mozilla Firefox error message SSL_ERROR_RX_RECORD_TOO_LONG.

1. Clearing the Cache- Sometimes, clearing the cache can solve this issue. One of the best and better way is to check whether the website in an Incognito or Private Window. Additionally, you can also use:

Ctrl+ Shift + R


Shift + click Reload current page

Mostly, it will fail. But, there’s nothing to lose, as it’s a safe and better way to check whether it solves the issue or not.

2. Changing the Preference of the security.tls.version.max- It’s not recommended but it can be useful in certain scenarios. For example, the website supports TLS 1.3 and Firefox also assumes it does but your Operating System on which Mozilla Firefox is running doesn’t support it. At that time, this SSL_ERROR_RX_RECORD_TOO_LONG error can occur.

So, if you’re using Microsoft Windows operating system and want to drop support for TLS 1.3 on a temporary basis, follow the steps given below.

  • In Mozilla Firefox, open a tab and in the address bar type “about:config” and click on “I accept the risk!” button.
  • In the search field, type: security.tls.version.max and then double-click on it.
  • A pop-up will be displayed, in that change the value from 4 to 3.

Another thing to note is that the values in Firefox support the TLS version. For example, 1 is for TLS 1.0, 3 is for TLS 1.3, and 3 is for TLS 1.2. Also, make sure you don’t go below TLS 1.2 as the versions below TLS 1.2 are not supported due to vulnerability issues.

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