ITS : Internet Transaction Server. It is a software component that acts as a gateway between a Web server and an SAP system. SAP ITS switches between Internet protocols and formats (such as HTTP, HTTPS, and HTML). Before SAP Web AS 6.40, ITS component is not integrated with SAP Web AS.

This is the procedure to activate HTTPS configuration in your stand alone ITS 6.20:
-Go to http://<ITShostname.com>:1080/scripts/wgate/wgate-config/!
-choose the ITS instance.
-Go to ‘Matching URLs’ and click ‘add’.
-Change line like : http xxxx 9999 /scripts/wgate ADM yes no
to : https _default_ 443 /scripts/wgate ADM yes yes
-Click ‘Activate new configuration’.