WCS Alarms reporting lost keepalive messages

Unanswered Question

Starting a few days ago, two of my WISM-based controllers generated this message: "Keepalive messages are lost between Controller 'xx.xx.xxx.xx'and Master.Please check the controllers port configuration,any software or hardware

incompatibility issues."

My question is what is considered the "Master?", What it is referring to? The only Master I know of within the context of the WISM is when you set up a Master Controller for configuration purposes, but this is something that I have NOT done and it is in fact, disabled.

I have this problem too.
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