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Scan Engine cannot communicate with any Scan Controller

I configured a scanner to use as an external scanner, located outside of my network (so it doesn't have to go through IPS or firewall or anything like that).  And when I initially set it up, it connects and shows up as green on the FCM and as Online on the MVM GUI.  However, each time, about a half hour later, it goes offline and on the FCM, I get the error message of "The Scan Engine cannot communicate with any Scan Controller,"  even though I have the Scan Controller specified and other engines are communicating with it fine.

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