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This article explains why you may see a Secure Connection Failed or a Did Not Connect: Potential Security Issue error page and what you can do.

Secure connection cannot be established

When a website that requires a secure (https) connection tries to secure communication with your computer, Firefox cross-checks this attempt to make sure that the website certificate and the connection method are actually secure. If Firefox cannot establish a secure connection, it will display an error page.

Secure Connection Failed

A Secure Connection Failed error page will include a description of the error, an option to report the error to Mozilla and a Try Again button. There is no option to add a security exception to bypass this type of error.

fx60SecureConnectionFailed-ErrorCode

The error page will also include the following information:

  • 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.

Did Not Connect: Potential Security Issue

Certain secure connection failures will result in a Did Not Connect: Potential Security Issue error page.

Fx66SecError-DidNotConnect Fx67SecError-DidNotConnect

The error page will include a description of the potential security threat, an option to report the error to Mozilla and a More Informationan Advanced… button to view the error code and other technical details. There is no option to add a security exception to visit the website.

Website issues

Some websites try using outdated (no longer secure) TLS mechanisms in an attempt to secure your connection. Firefox protects you by preventing navigation to such sites if there is a problem in securely establishing a connection. Contact the owners of the website and ask them to update their TLS version to a version that is still current and still secure.

Other websites may require HTTP Strict Transport Security (HSTS) and will not allow access with an insecure connection.

Security software conflict

Many security products use a feature that intercepts secure connections by default. This can produce connection errors or warnings on secure websites. If you see secure connection errors on multiple secure websites, updating your security product or modifying its settings may resolve the issue. See this article's section on Antivirus products for help with specific security products that can produce these errors, such as Avast, AVG and ESET software.

Alternatively, you can uninstall third-party security software and use Microsoft Security Essentials, the free antivirus offered by Microsoft for Windows 7.Alternatively, you can uninstall third-party security software and use Windows Defender, the built-in antivirus on Windows 8 and Windows 10.

Incorrect system clock

Firefox uses certificates on secure websites to ensure that your information is being sent to the intended recipient and can't be read by eavesdroppers. An incorrect system date can cause Firefox to detect that the website's security certificate is expired or invalid. Make sure your computer is set to the correct date, time and time zone. For more information, see How to troubleshoot time related errors on secure websites.

Other secure connection issues

To troubleshoot other secure connection issues not described above, see:

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