Mozilla Firefox users reported they come across the PR_CONNECT_RESET_ERROR when trying to connect to a website server. The request is declined and they don’t know what to do to fix the problem. This post introduces the network protocol error Firefox and several useful ways to settle down the issue.

Secure Connection Failed Firefox

Firefox, also called Mozilla Firefox, is one of the most popular web browsers around the world. It attracts many users since it’s free and open-source. However, just like other browsers, a series of problems could occur on Firefox. The PR_CONNECT_RESET_ERROR is one of them.

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Secure Connection Failed

An error occurred during a connection to *. PR_CONNECT_RESET_ERROR

  • The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
  • Please contact the website owners to inform them of this problem.


You can click on the Try Again button to give it a second chance. And you are advised to check the Report errors like this to help Mozilla identify and block malicious sites option.

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Most of the users don’t know what happened exactly by just looking at the error message in the window. This is exactly a network protocol error Firefox; the connection is terminated forcibly by the peer or some middlebox in between (most likely a firewall). There are many reasons that can be responsible for the secure connection failed issue.

  • TCP protocol filtering: it can interrupt the connection between the end-user and the webserver that users attempt to access.
  • Temporary files: some temporary files are able to interfere with the new webserver connections.
  • Overprotective firewall: it may bring interruption between the end-user and the webserver and a false positive may cause this behavior.
  • VPN or proxy: there may be security precautions in some websites to filter out the end-users connecting through a VPN or proxy.
  • Geo lock: it is able to prevent you from accessing some webservers from certain locations.

Read this page carefully when you find your Firefox doesn’t play videos:

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How to Fix Secure Connection Failed

Fix 1: clear cache.

  1. Make sure all the Firefox tabs are closed (except for the new tab).
  2. Click on the action button in the upper right corner of the window.
  3. Choose Options from the menu appeared.
  4. Go to the Settings menu and select Privacy & Security from the left sidebar.
  5. Scroll down in the right pane to find Cookies and Site Data section.
  6. Click on the Clear Data button.
  7. Uncheck Cookies and Site Data and check Cached Web Content.
  8. Click Clear and wait for it to complete.
  9. Restart the computer.

Cached Web Content

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Fix 2: uninstall the third-party firewall.

  1. Open Control Panel.
  2. Click Uninstall a program link under the Programs option.
  3. Scroll down to find the 3rd party firewall you have installed.
  4. Click it and choose Uninstall from the menu bar (you can also choose it from the context menu).
  5. Follow the instructions to uninstall the firewall completely.
  6. Reboot your PC.


Fix 3: disable VPN or proxy.

How to remove VPN client:

  1. Open Control Panel.
  2. Click Programs from the menu.
  3. Click Programs and Features.
  4. Scroll down the installed programs list to look for the active VPN client you’re deploying.
  5. Select it and click Uninstall.
  6. Finish the rest steps to uninstall the client completely.

How to remove proxy server:

  1. Press Windows + I to open Settings.
  2. Select Network & Internet.
  3. Shift to Proxy from the left sidebar.
  4. Look for the Manual proxy setup section in the right pane.
  5. Switch the toggle of Use a proxy server to Off.

Use a proxy server

There are also other ways you can try to troubleshoot network protocol error on Firefox.

  • Disable protocol filtering.
  • Connect to a different network.
  • Bypass the ISP lock if possible.
  • Disable the SSL scanning feature.
  • Check and change Firefox SSL settings.
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