Problem in configuring Foritgate-60C Web Cache for HTTPS

Hi All, Just find an interesting problem that I am try to enable Web cache on Firewall for user who is going to access internet.

After studying the CookBook (so you are not going to post me the Cookbook as answer), I try to use the following command to allow web cache in HTTPS:

config firewall policy

edit X

set webcache-https any

end

Of course, I use the Fortigate default SSL CA inspection also. The CA is also downloaded from Fortigate and installed on my PC as Root CA Trusted

Then, when I try to use IE visit Facebook/Google, everything is good. But while visit other Https website, something wrong.

Nevertheless, Chrome will not work at anyway and always appear SSL error even though the FaceBook or Google.

Anyone can advise?