HTTPS sites through a Proxy

Hi,

I use Google Chrome at work and at Home.

At work i go through a proxy and cannot access any https sites apart from gmail.com

Check out.

https://www.discovery.co.za/index_login.jhtml

I have tried a different proxy as well on another network and i have the same issue.

At Home i have a direct connection and have no issues.

Has no one else experienced this?

I work via proxy also at the office.
Just checked out a few sites using https and all working fine.