On the other hand, the OWA services use "tcp-default".
Note: this is shown in a screenshot below.
If we examine the properties of a service (or service group) we can also determine the monitor that is being used from this perspective:
Note: we can also create custom monitors.
With http, the NetScaler sends a http request ("GET" for example) to the target server and waits for a http status code in response ("200" for example).
When I tested this for OWA, I obtained the following result:
However, if I use the "https" monitor (with "Secure" checked in the monitor properties), I obtain this result:
"Click to select" a new monitor:
Note: yes, click on "Select" once you have made your selection.