We have occasionally seen that when configuring ControlSuite, it will hang at the "Setup Cassandra" stage and will not proceed.
There are many reasons why this could occur but 2 common causes are:
Cause 1: The cipher TLS_RSA_WITH_AES_256_CBC_SHA is not installed on the server.
Answer: Check to see if the cipher is installed and retry the Configuration Assistant in ControlSuite.
Cause 2: The SecurityFramework user profile is corrupted.
Answer: This can happen if ControlSuite is uninstalled and then reinstalled. Ensure that the SecurityFramework user profile is deleted. This can be done in the system properties of the server > user profiles. Select the SecurityFramework profile, delete it, reboot the server, then run the Configuration Assistant again.