Browsers show you an ugly red screen if you try to access a https website whose certificate is fake.
But why don't thes warn when you try to access a https site, like GMail, through the corporation's proxy?
If I understand proxies well, the computer asks them to load secure websites and tell the results, so the proxy will generate the https requests. Althrough the request between the proxy and web is secure, the sysadmin can still intercept your passwords and the content you viewing, isn't he?
Isn't this a security corcern?
(On many forums I saw many people think proxy = NAT, so I was unable to get my answer. :( )