Got it working!!
Actually I just set the capturing rule for my subnet – 192.168.1.0/24
and got the havp configured to see the parentproxy and port as told by Fulvio. Thanks man!
Even the authentication is happening smoothly via a Windows ADS,
Zeroshell is superb.
Only one small problem remains, how to disconnect users if they accidentally close their connection window, without clicking the “Discoonect” button