Demystifying SSL_ERROR_RX_RECORD_TOO_LONG: Causes, Fixes, and Prevention

SSL_ERROR_RX_RECORD_TOO_LONG - you've likely encountered this cryptic error message while trying to access a website. It's not only frustrating but also puzzling, leaving you wondering what it means and how to resolve it. In this blog, we'll demystify SSL_ERROR_RX_RECORD_TOO_LONG, exploring its causes, providing fixes, and discussing prevention strategies to ensure seamless and secure web browsing.

Understanding SSL and HTTPS

Before we delve into SSL_ERROR_RX_RECORD_TOO_LONG, let's establish a foundation by understanding SSL and HTTPS.

SSL (Secure Sockets Layer) and its successor, TLS (Transport Layer Security), are cryptographic protocols that provide secure data transmission over the internet. They create an encrypted connection between a user's browser and a web server, ensuring that data exchanged, such as login credentials or credit card information, remains private and secure.

HTTPS (Hypertext Transfer Protocol Secure) is a combination of HTTP and SSL/TLS. Websites that use HTTPS encrypt the data transferred between the user's browser and the web server, providing a secure and trustworthy browsing experience.


Now, let's tackle the SSL_ERROR_RX_RECORD_TOO_LONG error itself. This error message appears as a notification in your web browser, typically Firefox or Mozilla-based browsers. It can also manifest in the form of an error code, such as SSL_ERROR_RX_RECORD_TOO_LONG or SSL_ERROR_RX_MALFORMED_SERVER_HELLO.

The error essentially means that your browser received an SSL/TLS handshake message that was too long or improperly formatted. This usually occurs when your browser attempts to connect to a website via HTTPS, but the server responds with data that doesn't adhere to the expected SSL/TLS protocol.


SSL_ERROR_RX_RECORD_TOO_LONG is an error that occurs when there is a problem with the SSL/TLS (Secure Sockets Layer/Transport Layer Security) handshake process during an attempt to establish a secure connection between a web browser and a web server. This error can be quite frustrating for users, and it's important to understand its common causes. Here are the primary reasons behind SSL_ERROR_RX_RECORD_TOO_LONG:

  1. Mixed Content: Mixed content occurs when a website is delivered over HTTPS (secure) but includes resources like images, scripts, or stylesheets that are loaded over unsecured HTTP. Browsers often block these insecure resources, leading to the SSL_ERROR_RX_RECORD_TOO_LONG error.
  2. Incorrect Port: Web servers typically listen on specific ports for different types of traffic. For example, HTTP typically uses port 80, and HTTPS uses port 443. If a browser attempts to connect via the wrong port (e.g., using HTTP on port 443), the server may respond with an incorrect SSL/TLS handshake, triggering the error.
  3. Server Misconfiguration: Misconfigurations on the web server's side can lead to SSL_ERROR_RX_RECORD_TOO_LONG. This might involve incorrect SSL/TLS settings, outdated or improperly configured certificates, or unsupported SSL/TLS protocol versions.
  4. Browser Cache Issues: Outdated or corrupted data in a browser's cache can sometimes interfere with the SSL/TLS handshake process, leading to handshake errors. Clearing the browser cache can resolve this issue.
  5. Firewall or Security Software: Overzealous firewall or security software can sometimes interfere with the SSL/TLS handshake process. These tools may block or manipulate the secure connection, leading to the SSL_ERROR_RX_RECORD_TOO_LONG error.

Understanding these common causes can help users and website administrators diagnose and resolve the SSL_ERROR_RX_RECORD_TOO_LONG error when they encounter it.


SSL_ERROR_RX_RECORD_TOO_LONG can be a frustrating error to encounter while browsing the web. However, there are several fixes you can try to resolve this issue and access secure websites without interruption. Here are some effective fixes for SSL_ERROR_RX_RECORD_TOO_LONG:

  1. Clear Browser Cache:
  • Sometimes, the error can be caused by corrupted cache data in your browser. Clear your browser's cache to eliminate this potential problem.
  • In Firefox, go to "Options" > "Privacy & Security" > "Clear Data" and select "Cached Web Content" and "Cookies and Site Data."
  1. Check the URL:
  • Ensure you're entering the correct URL with "https://" at the beginning. Double-check for any typos or missing characters. A simple URL correction can resolve the error.
  1. Disable Browser Extensions:
  • Some browser extensions may interfere with the SSL/TLS handshake process. Try disabling or temporarily uninstalling your extensions to see if they are causing the problem.
  1. Disable Security Software or Firewall:
  • If you suspect that your firewall or security software is causing the SSL_ERROR_RX_RECORD_TOO_LONG error, try disabling them temporarily. Remember to re-enable them once you've tested this to maintain your security.
  1. Verify Server Configuration:
  • If you're the website owner or administrator, ensure that your server's SSL/TLS configuration is correct. Check that the SSL/TLS certificates are up to date and that the server supports the SSL/TLS protocol version you are using. Consult your server's documentation for guidance.
  1. Ensure Correct Port:
  • Ensure that your browser is using the correct port for the type of connection you're trying to establish. For HTTPS, the standard port is 443. Make sure your URL specifies this port.
  1. Resolve Mixed Content:
  • If the SSL_ERROR_RX_RECORD_TOO_LONG error occurs on a website you manage, check for mixed content issues. Ensure that all resources are loaded via HTTPS. Update any insecure resource references to secure ones.
  1. Check for Server Downtime:
  • Sometimes, the error may not be related to your setup but rather to the web server itself. Check if the website is currently down or experiencing technical issues.

By following these fixes, you can often resolve the SSL_ERROR_RX_RECORD_TOO_LONG error and enjoy a secure and seamless browsing experience. If the error persists, it's advisable to reach out to the website's administrators or your organization's IT support for further assistance.

Prevention Strategies

Preventing the SSL_ERROR_RX_RECORD_TOO_LONG error is essential to ensure smooth and secure web browsing. Here are some prevention strategies to help you avoid encountering this error:

  1. Keep Certificates Updated:
  • If you own or manage a website, make sure to keep your SSL/TLS certificates up to date. Expired or invalid certificates can lead to handshake errors. Regularly renew and update your certificates to maintain a secure connection.
  1. Regularly Test Your Website:
  • Use SSL/TLS testing tools and services to check your website's SSL/TLS configuration regularly. These tools can help you identify and resolve potential issues before they cause problems for users.
  1. Use Secure URLs:
  • Ensure that all resources on your website are referenced via secure URLs (https://) to prevent mixed content issues. Whenever you add or update content on your site, double-check that all links and references use HTTPS.
  1. Implement Robust Server Monitoring:
  • Implement server monitoring to quickly identify and resolve server downtime or misconfigurations. Monitoring tools can alert you to potential issues, allowing you to address them proactively.
  1. Stay Informed:
  • Stay informed about the latest SSL/TLS developments, security best practices, and updates in the world of web security. By staying up to date, you can be better prepared to make necessary adjustments to your server's configuration.

Preventing SSL_ERROR_RX_RECORD_TOO_LONG often involves proactive measures to maintain the security and functionality of your website. By regularly monitoring and updating your SSL/TLS certificates, checking for mixed content issues, and staying informed about best practices, you can ensure a secure and error-free browsing experience for your users.


The SSL_ERROR_RX_RECORD_TOO_LONG error may seem intimidating, but it often has straightforward solutions. By understanding the causes, applying fixes, and implementing prevention strategies, you can ensure that your web browsing experience remains secure and error-free. Whether you're a user troubleshooting the error or a website owner aiming to prevent it, SSL_ERROR_RX_RECORD_TOO_LONG doesn't have to be a daunting challenge.


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