How to solve secure connection failed?

Troubleshooting Secure Connection Failed Error in Firefox

Firefox’s “Secure Connection Failed” error can be frustrating, preventing you from accessing secure websites. To resolve this issue, follow the troubleshooting steps below:

1. Disable HTTPS Scanning:

• Open Firefox and go to “Options” (or “Preferences” on macOS).
• Navigate to the “Privacy & Security” tab.
• Scroll down to the “HTTPS-Only Mode” section and uncheck the “Enable HTTPS-Only Mode in all windows” box.
• Click “OK” to save changes.

2. Adjust Proxy Configurations:

• Go to “Options” and click on the “Network Settings” tab.
• Under “Connection,” select “Settings…”
• In the “Proxy” tab, make sure that “No proxy” is selected.
• If a proxy is configured, try disabling it temporarily.

3. Check SSL Settings:

• Firefox uses Secure Socket Layer (SSL) to establish secure connections.
• Go to “Options” and select the “Advanced” tab.
• Under “Network,” click on the “Settings…” button.
• Verify that “SSL 3.0” and “TLS 1.0” are both enabled in the “Protocols” section.

4. Disable DoH (DNS over HTTPS):

• DNS over HTTPS (DoH) can sometimes interfere with secure connections.
• Go to “Options” and select the “Privacy & Security” tab.
• Under “DNS,” select “Use system DNS settings” and uncheck the “Enable DNS over HTTPS” box.

5. Clear Firefox Cache and Cookies:

• Go to “Options” and select the “Privacy & Security” tab.
• Under “History,” click on the “Clear Browsing Data…” button.
• Select the “Cache” and “Cookies” options and click “Clear.”

6. Update Firefox:

• Ensure that you are using the latest version of Firefox.
• Go to the Firefox menu and select “Help” > “About Firefox.”
• Firefox will automatically check for updates and install them if available.

7. Check Firewall and Antivirus Software:

• Make sure that your firewall or antivirus software is not blocking Firefox’s secure connections.
• Temporarily disable these programs to test the issue.

If none of these steps resolve the “Secure Connection Failed” error, you may need to contact your network administrator or internet service provider for further assistance.