Can't enable Monitors in the CEM UI

Document ID : KB000125321
Last Modified Date : 25/01/2019
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Issue:
If you see a message like this " [Manager.com.timestock.tess.services.tim.TimIo] cannot send timconfig to monitor id=700000000000012598: Connection Failure: Error retrieving response http://X.X.X.X:80/wily/cem/tim/tess/settimconfig: connect timed out" when you are enabling a monitor in the CEM UI.
Environment:
Tim 10.7
Cause:
The subnet mask was not set properly in the Machine Setting > Network Setup
Resolution:
We set the correct subnet mask in Machine Setting > Network Setup.  In this case we set it to 255.255.255.0