<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body><div><div style="font-family: Calibri,sans-serif; font-size: 11pt;">I also use Facebook multiple times every day and have never seen that message. I use a Chromium-based browser (Vivaldi or Opera) run on Vista32.<br><br>Perhaps Facebook were doing something to their certs at just the time you happened along?<br><br>Does Google (or whoever) show that anyone else noticed?<br><br>Brian</div></div><div dir="ltr"><hr><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">From: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:lists@internetpolicyagency.com">Roland Perry</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Sent: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;">13/05/2015 22:27</span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">To: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:ukcrypto@chiark.greenend.org.uk">ukcrypto@chiark.greenend.org.uk</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Subject: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;">Re: Geekspeak I don't understand</span><br><br></div>In article <20150513123103.GA25424@unequivocal.co.uk>, Jon Ribbens <br><jon+ukcrypto@unequivocal.co.uk> writes<br>>> or what's amiss in 'my setup'?<br>>><br>>> "An error occurred during a connection to www.facebook.com. The server uses<br>>> key pinning (HPKP) but no trusted certificate chain could be constructed<br>>> that matches the pinset. Key pinning violations cannot be overridden. (Error<br>>> code: mozilla_pkix_error_key_pinning_failure)<br>>><br>>> The page you are trying to view cannot be shown because the<br>>> authenticity of the received data could not be verified.<br>>><br>>> Please contact the website owners to inform them of this problem."<br>><br>>Is it a corporate computer or similar that might have a root<br>>certificate installed by the IT department?<br><br>No, it's my five year old laptop where only I am the administrator.<br><br>Not sure if it matters but about three months ago I wiped the <br>Win7-upgraded-to-Win8 installation and did in effect a "factory reset" <br>back to Vista.<br><br>I use Facebook multiple time most days (for years), and have never <br>before seen any error message like this.<br>-- <br>Roland Perry<br><br></body></html>