Skip to content

Pr_End_Of_File_Error ‘Secure Connection Failed’ on Firefox: 5 Fixes

  • by
  • 4 min read

Firefox has been on the rise for quite some time now, giving Chrome fierce competition in the browsing space despite being relatively lesser-known. However, just like everything tech, the browser isn’t perfect either.

While bugs and errors are rare, they still do occur. In this article, we’re taking a look at the PR_END_OF_FILE_ERROR on Firefox. 

What causes the Pr_End_Of_File_Error?

Several reasons can trigger the error, so it’s hard to pinpoint an exact cause. Here are some of the more common ones.

  • VPN or Proxy interference: A VPN or Proxy can interfere with Firefox’s functionality triggering this error in turn.
  • Third-party antiviruses: Third-party antiviruses or antimalware can also at times be too obtrusive and interfere with Firefox. 
  • Incorrect cipher variants: If you’ve modified your SSL settings, chances are your browser is now enforcing some incorrect cipher settings on each site you visit. 
  • Corrupt Firefox profile: The error can also be triggered when using a corrupt Firefox profile. 

Also read: Chrome vs Edge vs Firefox: Which browser should you pick?

How to fix the Pr_End_Of_File_Error?

Here are a few solutions you can try out to get rid of this error.

Clear your browser’s cache

Corrupt files in your browser’s cache can cause all sorts of problems, including this one. Here’s how you can clear out the cache in Firefox.

Step 1: Click on the hamburger menu icon in the top right and click Options.

How to fix 'pr_connect_reset_error'? | Candid.Technology

Step 2: Head over to the Privacy & Security tab. 

How to fix 'pr_connect_reset_error'? | Candid.Technology

Step 3: Scroll down to Cookies and Site Data and click on the Clear Data… button.

How to fix 'pr_connect_reset_error'? | Candid.Technology

Step 4: Check Cookies and Site Data as well as Cached Web Content and click on Clear. 

How to fix 'pr_connect_reset_error'? | Candid.Technology

Restart your browser and try accessing the site again.

Also read: How to fix the Android Auto not working error?

Remove any third-party firewalls

If you’re using any other firewalls apart from the default Windows one, chances are it’s sending an RST to Firefox to terminate the attempted connection between the browser and the webserver. 

Try disabling or removing the firewall to check if the browser works without one. If it does, either remove the firewall for good or add an exception for Firefox in the firewall settings. 

Disabling any proxies or VPNs that you might be using

Another rather common reason people run into this issue is when they’re trying to connect to a host through a proxy or a VPN connection, and the host keeps on denying the connection request.

Several high profile sites, especially streaming ones like Netflix and Amazon Prime Video, detect and disable proxies or VPNs these days. In such cases, the solution is pretty straightforward. You disable your proxy or VPN client and try connecting to the host again. The Pr_End_Of_File_Error’ Secure Connection Failed’ should be fixed.

Also read: What is I/O device error? 7 Fixes

Disable DNS over HTTPS

Disabling Firefox’s DNS over the HTTPS function can also help you solve the problem.

Step 1: Open Firefox and head over to the Settings page. Scroll down to the bottom and click Settings under Network Settings.

Pr_End_Of_File_Error 'Secure Connection Failed' on Firefox: 5 Fixes

Step 2: Uncheck Enable DNS over HTTPS and click OK.

Pr_End_Of_File_Error 'Secure Connection Failed' on Firefox: 5 Fixes

Now restart the browser and try again.

Create a new profile

Lastly, you can try creating a new profile as well. 

Step 1: Open Firefox and head over to this address — about:profiles

Pr_End_Of_File_Error 'Secure Connection Failed' on Firefox: 5 Fixes

Step 2: Click the Create a new profile button and follow along with the instructions. 

Pr_End_Of_File_Error 'Secure Connection Failed' on Firefox: 5 Fixes

Once your profile has been created, restart the browser to see if you can access webpages now. The Pr_End_Of_File_Error’ Secure Connection Failed’ should be fixed.

Also read: refused to connect: 6 Fixes

Yadullah Abidi

Yadullah Abidi

Yadullah is a Computer Science graduate who writes/edits/shoots/codes all things cybersecurity, gaming, and tech hardware. When he's not, he streams himself racing virtual cars. He's been writing and reporting on tech and cybersecurity with websites like Candid.Technology and MakeUseOf since 2018. You can contact him here: