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Disabling Firefox’s ‘Secure Connection Failed’ Warning

Posted onOctober 21, 2008 by Anil Polat

Aunque controvertida , la advertencia de error de conexión segura de Firefox 3, que se muestra cuando el certificado digital de un sitio web no es válido o está autofirmado, se puede desactivar fácilmente.

  1. En la barra de direcciones, escriba about:config > haga clic en ‘Enter’.
  2. Recibirá un mensaje de advertencia, ¡Esto podría anular su garantía! Haga clic en ¡ Tendré cuidado, lo prometo!
  3. Haga doble clic en browser.ssl_override_behavior y cambie el valor de ‘1’ a ‘2’.
  4. Reinicie Firefox.

Instead of disabling the prompt completely, you can display a warning, without having to add an exception.

Firefox’s antiphishing warnings will continue to warn users if a specific site is suspicious. I’m not convinced that the secure connection failure warning really helps the average user, as they won’t know what it is. Either way, now you can avoid it.

Cada martes, Security Musings presented a tema para ayudar a educar a nuestros lectores sobre la seguridad. For more information on Gemini Security Solutions’ education and security capabilities, ¡contact us!

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18 avril 2022

Leonard N.

6min read

How to fix PR_END_OF_FILE_ERROR: 3 methods that work

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Most websites implement a secure connection protocol using Secure Sockets Layers (SSL) or Transport Layer Security (TLS). While this secure connection creates a safe browsing experience, it can also trigger some errors that may frustrate users.

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One of such messages is PR_END_OF_FILE_ERROR – Firefox browser may throw this error from time to time. This article will explain what it is, its causes, and three simple ways to fix the PR_END_OF_FILE_ERROR secure connection failed error.

Error type Browser error
Error variations Secure Connection Failed
Error causes VPN or proxy interference Incorrect cipher variants Corrupted Firefox profile Third-party security software interference

What Causes the PR_END_OF_FILE_ERROR (Secure Connection Failed) Error?

The PR_END_OF_FILE_ERROR error message appears when the Mozilla Firefox browser can’t establish a secure connection. It is a Firefox-specific error and won’t appear in any other browser. Thus, this often affects many websites you try to visit, as the problem is on the client-side.

To understand why PR_END_OF_FILE_ERROR happens, we have to understand the process of establishing a secure connection between a browser and a website.

Your browser has a cipher suite – a set of algorithms that makes a secure connection over an encrypted protocol possible. When you visit a website that uses SSL or TLS, the browser runs through the cipher suite until it finds a matching algorithm for the connection.

However, if Firefox reaches the end of the cipher suite file and doesn’t find a match, it results in the PR_END_OF_FILE_ERROR message.

In general, this error has four possible causes:


Multiple aspects can trigger the PR_END_OF_FILE_ERROR secure connection failed issue. We will cover three ways to fix it from different possible sources of the error – the Firefox settings, a proxy or VPN connection, and third-party security software.

Before proceeding to the different methods to fix the secure connection failed error, check if the website is down for all visitors or whether you’re the only one unable to access it.

1. Go Through Your Firefox Settings

Since PR_END_OF_FILE_ERROR is a Firefox-specific issue, we’ll start by reviewing the browser settings.

Reset Firefox SSL Settings

You may have modified the browser’s SSL settings, triggering the issue. Refreshing Firefox settings can resolve this secure connection error. Follow these steps to do so:

  1. Click the hamburger menu at the top-right corner and click Help.

  1. Select More Troubleshooting Information.

  1. The Troubleshooting Information tab will show the diagnostics. At the top-right corner, click the Refresh Firefox button under Give Firefox a tune up.

  1. A prompt pop-up screen will appear. Click the Refresh Firefox button.

The browser will automatically close, and a new window will appear, showing the reset progress. Once it restarts, the browser will use its default configuration, including the SSL settings.

Revisit the website to see whether the reset resolved the issue. If the error persists, try the next method.

Disable DNS Over HTTPS

When you try to open a website, your browser sends a DNS request to the server. DNS over HTTPS is a protocol that sends these requests through HTTPS.

Enabling it prevents malicious attackers from eavesdropping and seeing your online activity. Unfortunately, this feature can also trigger the PR_END_OF_FILE_ERROR.

However, disabling it is a quick fix. Follow these steps to disable DNS over HTTPS:

  1. Click on the hamburger menu at the top-right corner and click Settings.

  1. On the General screen, scroll down to the bottom, and you’ll find the Network Settings section. Click Settings.

  1. At the bottom of the Connection Settings window, there’s an Enable DNS over HTTPS option. Uncheck the box and click OK.

Restart the browser and see if this resolved the secure connection failed error.

Create a New Firefox Profile

If all the previous methods for PR_END_OF_FILE Firefox error didn’t work, your Firefox profile might be corrupted. So, you will need to create a new profile.

We suggest exporting bookmarks before creating a new profile. Therefore, if this method resolves the error, you can easily import the bookmarks to use on your new Firefox browser profile.

  1. Open the bookmark manager by clicking CTRL+Shift+O. Alternatively, click the hamburger menu, select Bookmarks, and click Manage bookmarks at the bottom.
  2. Select All Bookmarks.

  1. Click Import and Backup and select Export Bookmarks to HTML.

  1. A new window will appear. Select the folder to save the bookmark data and click Save.

Now, follow these steps to create a new profile.

  1. Type about:profiles in the address bar and press Enter.
  2. Click the Create a New Profile button.

  1. The Create Profile Wizard will appear. Follow the on-screen instructions.

  1. Once it’s done, the new profile will appear on the profile manager page.
  2. Click Launch profile in new browser.

Try to revisit the website with the new profile. If it works, then the corrupt Firefox profile was the main issue causing secure connection failed error.

Now all you have to do is import the bookmarks to the new profile. Similar to the export bookmark process, open the bookmark manager and choose Import Bookmarks from HTML, then select the saved file.

2. Turn Off Your VPN or Proxy

Browsing the internet using a proxy or VPN server can also trigger the PR_END_OF_FILE_ERROR. These services interfere with the connection by acting like a middle man, which sometimes makes the connection protocol unable to find the correct cipher suites.

If that’s the case, disabling VPN or proxy should fix the PR_END_OF_FILE_ERROR.

The steps to turn it off depend on the VPN application you use but, most of the time, it’s a simple process. Below is an example of the NordLayer VPN app’s interface:

If you use a proxy connection, you have to disable it from the system’s proxy settings, and the steps are different for Windows and macOS users.


Turn off the proxy server in the system settings. Here are the steps to do so:

  1. Open the Windows Settings and go to Network and Internet.

  1. Select Proxy on the left panel.
  2. Scroll down to the Manual proxy setup section and switch off Use a proxy server.

  1. Reboot the computer so that the change takes place and revisit the website using the Firefox browser.


In macOS, you have to uncheck all proxy protocols, like so:

  1. Open System Preferences and select Network.

  1. Select Wi-Fi on the left panel, then click the Advanced button.

  1. Open the Proxies tab. Uncheck all items on the Select a protocol to configure box and click OK.

  1. Reboot your computer and use the Firefox browser to revisit the website.

Firefox Proxy Settings

It’s also possible that the proxy connection is active on your Firefox connection settings, causing PR_END_OF_FILE_ERROR. Follow these steps to turn it off:

  1. Haga clic en el menú de hamburguesas en la esquina superior derecha y seleccione Configuración .
  2. Desplácese hacia abajo hasta encontrar la sección Configuración de red y haga clic en Configuración .

  1. Aparecerá la ventana Configuración de conexión ; encontrará Configurar acceso de proxy a Internet en la parte superior. Marque la opción Sin proxy y haga clic en Aceptar para guardar.

Ahora, reinicia Firefox para ver si funcionó.

3. Deshabilitar temporalmente el software de seguridad

Este método es más aplicable a los usuarios de Windows, ya que el sistema operativo a menudo se basa en software de seguridad de terceros.

Algunos software de seguridad o antivirus como Kaspersky , BitDefender y ESET pueden percibir los conjuntos de cifrado como amenazas potenciales. En ese caso, interceptan la conexión y usan su protocolo seguro, lo que resulta en un error de falla de conexión segura de Firefox.

Puede considerar apagar el software por completo, pero hacerlo expondrá su computadora a riesgos de seguridad.

Recomendamos deshabilitar solo la protección en tiempo real en su software antivirus, si es posible. Esta característica rastrea su actividad e intercepta la conexión de red inmediatamente si encuentra alguna amenaza.

If you can’t download manually, the only option is disabled for full software. The method is different depending on the software used. In general, you can find the adjustments in the control panel or in the configuration section.

After disabling the software, reboot the computer and intend to return to the website. If the security software is real, this is the root cause of the problem, which has been replaced by a single active PR_END_OF_FILE_ERROR.

Troubleshooting Other Browser Errors

¿How to correct the error of too many redirections? ¿Cómo resolver 400 – Incorrect solicitation error? How Resolver ERR_CACHE_MISS? How to fix Localhost connection error?


The Mozilla Firefox segura connection error occurs when you browse without being able to encounter a coincident cifrado conjunto para establish a segura connection con el website.

This can trigger misconfiguration in browser configuration, VPN or proxy issues, or interference with security software.

In short, this is what you can do to fix this Firefox error:

  1. I went through the Firefox configuration . The simplest form of solution is connection error segura is restoring the configuration of Firefox. If not functional, disable DNS over HTTPS or create a new Firefox profile.
  2. Disable VPN client or proxy service . Su VPN and its proxy service may interfere with the connection. Intente apagarlos para resolver el error.
  3. Deactivate the security software . Some security programs may consider cipher suites to be security threats. Disable real-time protection in the software if possible. Contrariwise, the software is temporarily inapt and, if you find the secure connection error, look for an alternative software.

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The author

Leonard N.

Leo is a digital content writer at Hostinger. He enjoys sharing his knowledge of web hosting and WordPress to help people establish a successful online presence. In his spare time, he enjoys playing music and learning audio engineering.

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