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Per Help (bold is mine):
Even though they’re not directly used by Tableau Server, if a JMX port is being used by another application, Tableau Server processes won’t run. In addition, JMX ports cannot be edited directly using tabadmin. You change a JMX port by changing the base port for its process. In other words, if port 10000 isn’t available for the data server JMX process, you use tabadmin (as described in Edit the Default Ports) to change the data server base port from 9700 to 9800. This will move the data server JMX port to 10100.
You can use netstat -aonb > someFile.txt to figure out which ports are your "problem children", and then use the "Edit the Default Ports" link above" to adjust them. Or just attack the ones that seem to be failing if you don't feel like being scientific about it
Thank you Christopher.
I have changed the data server port to 9700 and everything is working as expected.