SYMPTOM:
Even though there are multiple Strategy Intelligence Servers 9.4.x-10.x available within the same network and the service is up and running, not all of the Server names appear in the drop down list of Integrity Manager 9.4.x-10.x.

CAUSE:
One of the typical reasons is that the Strategy Listener is not running on the machine where the Intelligence Server to be connected is running.

ACTION:
Start Strategy Listener or try connecting the Intelligence Server by directly typing its name or IP address.
On related symptom, also refer to: