How To Fix SEC ERROR_UNKNOWN_ISSUER in Firefox

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How To Fix SEC_ERROR_UNKNOWN_ISSUER in Mozilla Firefox

sec error unknown issuer firefox fix.

This error occurs when Intermediate CA certificates are not installed on the server. When Intermediate CA's are installed properly on the server, they will be presented to the client connecting and used during the secure session, and therefore no action is required on the client side.

This tutorial will apply for computers, laptops, desktops,and tablets running the Windows 11, Windows 10, Windows 8/8.1, Windows 7 operating systems.Works for all major computer manufactures (Dell, HP, Acer, Asus, Toshiba, Lenovo, Samsung).

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