How to configure Client Certificate Emulation.
This feature is available starting in ASG/ProxySG versions 6.7.x and greater.
Please reference the 6.7 Release Notes which can be downloaded at https://support.symantec.com > Downloads > Network Protection (BlueCoat) Downloads - and navigate to the 6.7 release notes for the Proxy or ASG.
The Admin Guide also covers this topic. Find this Admin guide linked below: