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Fix the PR_END_OF_FILE_ERROR in Firefox

Firefox could not finish a secure connection. Check your antivirus, VPN and browser settings.

How-To Guides2 min read11 steps3 screenshots

What it means

The error PR_END_OF_FILE_ERROR appears in Firefox when the secure connection to a site ends in the middle of the handshake.

The PR_END_OF_FILE_ERROR in Firefox

Common causes:

  1. Antivirus or firewall software that misreads the secure connection.
  2. A VPN or proxy with wrong settings or limits.
  3. SSL settings in Firefox or on the server.
  4. A short network problem on your side or on the site.

Fixes

  1. Clear history and cache. Press Ctrl + Shift + Delete, choose Everything as the time range and click OK.
    Clearing the history in Firefox
  2. Turn on DNS over HTTPS. Open Settings, then General, scroll to Network Settings and click Settings. Tick Enable DNS over HTTPS at the bottom. Test the site again.
    Enabling DNS over HTTPS
  3. Turn off the VPN or proxy for a test.
  4. Turn off antivirus HTTPS scanning or the firewall for a moment, and test the page.
  5. Start Firefox in Troubleshoot Mode (Help, then Troubleshoot Mode) to test without extensions.
  6. Update Firefox and restart it.
  7. If only one site fails, contact the site owner. Their server may use a wrong TLS setup.

Good to know

  • Update Firefox to get the latest security fixes.
  • Browser add-ons can break secure connections. Turn them off one by one to find the cause.
  • In rare cases, a complex network problem causes the error. Try another network.

Quick recap

  • The secure connection broke in the middle.
  • Clear the cache, enable DNS over HTTPS and check the VPN and antivirus.
  • Contact the site if only one site fails.