I am also flipping over to HTTPS, and chrome is reporting that the cert is 
valid, and upon inspection all looks as it should be. The trust chain goes up 
to a Versign root cert, so my guess is that is a bad cert you are seeing, and 
if inside china it might just be a plain old mitm.

-Andrew


On Oct 5, 2014, at 11:52 PM, Eric S Johnson <[email protected]> wrote:

> I just got back to CN from a vacation. I’m now (in all three main Windows 
> browsers) seeing yahoo.com automatically flip over to HTTPS--and then give a 
> bad cert error. The *root* cert is listed as yahoo.com and is valid “23 Sep 
> 14 to 23 Sep 15.”
>  
> Is Y! experimenting with making access to their resources always-only-HTTPS? 
> Are they having certificate problems? “HTTP only” seems like a good direction 
> in which to go, but teaching people to accept bad cert warnings seems like a 
> bad direction in which to go.
>  
> Best,
> Eric
> OpenPGP: 0x1AF7E6F2 ● Skype: oneota ● XMPP/OTR: [email protected] ● 
> Silent Circle: +1 312 614-0159
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