Geekspeak I don't understand

Roland Perry lists at
Wed May 13 22:27:10 BST 2015

In article <20150513123103.GA25424 at>, Jon Ribbens 
<jon+ukcrypto at> writes
>> or what's amiss in 'my setup'?
>> "An error occurred during a connection to 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."
>Is it a corporate computer or similar that might have a root
>certificate installed by the IT department?

No, it's my five year old laptop where only I am the administrator.

Not sure if it matters but about three months ago I wiped the 
Win7-upgraded-to-Win8 installation and did in effect a "factory reset" 
back to Vista.

I use Facebook multiple time most days (for years), and have never 
before seen any error message like this.
Roland Perry

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