Error sec_error_inadequate_key_usage when using HTTPS in Firefox

After a recent update of my Firefox browser, I wasn’t able to connect to SSL encrypted websites using HTTPS anymore. I got the following error code: sec_error_inadequate_key_usage

sec_error_inadequate_key_usage when connecting via HTTPS in Firefox

The solution was to set security.use_mozillapkix_verification to false under about:config.

about:config - security_use_mozillapkix_verification

For an explanation, please see: Exciting Updates to Certificate Verification in Gecko and Security certificate no longer valid after upgrading to latest FF.

Über Stefan

Polyglot Clean Code Developer

Ein Kommentar

  1. security.use_mozillapkix_verification is not in the about:config

Schreibe einen Kommentar

Deine E-Mail-Adresse wird nicht veröffentlicht. Erforderliche Felder sind mit * markiert

To create code blocks or other preformatted text, indent by four spaces:

    This will be displayed in a monospaced font. The first four 
    spaces will be stripped off, but all other whitespace
    will be preserved.
    Markdown is turned off in code blocks:
     [This is not a link](

To create not a block, but an inline code span, use backticks:

Here is some inline `code`.

For more help see