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Home / cloud-software / Fix 'Secure Connection Failed' Error in Firefox for Android - How to Fix net::ERR_CERT_AUTHORITY_INVALID on Linux-Windows 11 Installation Assistant Hangs at 99% – Antivirus Fix

Fix 'Secure Connection Failed' Error in Firefox for Android - How to Fix net::ERR_CERT_AUTHORITY_INVALID on Linux-Windows 11 Installation Assistant Hangs at 99% – Antivirus Fix

Updated 2026-07-28 11:12:18cloud-software
Fix 'Secure Connection Failed' Error in Firefox for Android - How to Fix net::ERR_CERT_AUTHORITY_INVALID on Linux-Windows 11 Installation Assistant Hangs at 99% – Antivirus Fix
Before changing system settings, save your work and note the exact error text so you can compare results after each step.

Extra verification checklist

  • Restart the affected app after changing permissions or configuration files.
  • Test the same workflow in a clean browser profile or a temporary user account.
  • Compare the result on another network if the error may be connection related.

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