Geekspeak I don't understand

[Peter Fairbrother]

On 12/05/15 21:02, Roland Perry wrote:
> Can anyone tell me what this really means, and what might have gone
> wrong, or what's amiss in 'my setup'?
>
> "An error occurred during a connection to www.facebook.com. The server
> uses key pinning (HPKP) but no trusted certificate chain could be
> constructed that matches the pinset. Key pinning violations cannot be
> overridden. (Error code: mozilla_pkix_error_key_pinning_failure)
>
>      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."

BTW, to turn pinning off in Firefox, if it's a continuing problem:

Type about:config in the browser address bar.

Click OK on the warning.

Set the preference security.cert_pinning.enforcement_level to 0.

-- Peter F