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For an explanation, please see: Exciting Updates to Certificate Verification in Gecko and Security certificate no longer valid after upgrading to latest FF.

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Polyglot Clean Code Developer

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