Kickstart produces error with option "firewall --https"

Issue

• Kickstart option 'firewall --https' not supported in Red Hat Enterprise Linux 6.

• The kickstart file has the following configuration :

firewall --ssh --http --https --port=1231:udp

• However the installer fails with the message :

The following problem occurred on line 18 of the kickstart file:

no such option: --https

install exited abnormally [1/1]
The system will be rebooted when you press Ctrl-C or Ctrl-Alt-Delete.