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How to Fix PR_CONNECT_RESET_ERROR Firefox Error



Many people trusts Mozilla Firefox as their default browser on their computers. However, when trying to connect to an HTTPS server, some users face the error PR_CONNECT_RESET_ERROR. When you encounter the problem, it shows the error message,

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.


There are several reasons why you are getting the “PR CONNECT RESET ERROR: Secure Connection Failed” issue on your Firefox browser. May it be that you are using a Windows 10 PC or a Mac computer, here are some possible causes:

  • Your firewall or antivirus app is preventing the connection.
  • Your VPN may be the source of the error.
  • Your TCP Protocol Filtering may be interrupting the connection.
  • There may be temporary file blocking in the process.
  • There may be restricted networks interfering.

Fix PR_CONNECT_RESET_ERROR: Secure Connection Failed on Firefox Browser

If you see the PR_CONNECT_RESET_ERROR on your Firefox browser, there are a number of possible solutions to troubleshoot and fix the issue. Follow each method below one at a time and check if it solves the connectivity problem.

Solution #1 – Clear the Firefox Browser Cache

Credit: Windows Dispatch
  • On the upper-right corner of your Mozilla Firefox browser, click the Hamburger icon or the Menu button.
  • Select Option.
  • Go to Privacy and Security.
  • Navigate to Cookies and Data.
  • Click Clear Data.
  • Check the box next to Cached Web History.
  • Click Clear/OK.

Solution #2 – Disable Your VPN Server


If you are using a VPN client, try to disable it first and check if it solves the issue.

  • Launch the Control Program.
  • Go to Programs or Programs and Features.
  • Look for the VPN you are using.
  • Click the VPN client.
  • Select Uninstall.

Some VPN service providers, such as NordVPN or ExpressVPN does not interfere with your browser’s connection protocols. You can check them out if you really need a VPN service running to avoid connection errors like this on Firefox.

Solution #3 – Disable the TCP Protocol Filtering


If you are using third-party antivirus software like ESET Antivirus, follow this step to disable the TCP Protocol Filtering.

  • Launch the ESET Antivirus Software.
  • Click Advanced.
  • Select Web and Email.
  • Look for Protocol Filtering.
  • Click the Plus sign beside it to expand the menu.
  • Slide to Disable button next to Enable application protocol content filtering.
  • Click OK.

Solution #4 – Try Using a Different Network

It may be an issue with the current network you are using. If you have a different network connection, try using it and see if the problem is still there.

Solution # 5 – Uninstall Third-Party Antivirus

If nothing works, try to disable or completely uninstall your 3rd-party antivirus protection. Some softwares that might cause this issue include Kaspersky, Avast, ESET, and BitDefender.

  • Launch the Control Panel.
  • Go to Programs and Features.
  • Click Uninstall a program.
  • Select your antivirus software.
  • Click Uninstall.
  • After uninstalling the software, restart your computer.

Which of the solutions above helped you fix the error? We would like to know which method works best, so tell us in the comments below.



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