AE server process fails to start and a U00011893 Work process 'UC4T#WP004' will be shut down error appears in the log

Document ID : KB000084609
Last Modified Date : 14/04/2018
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Error Message :
U00011893 Work process 'UC4T#W04' will be shut down because its netArea differs from the netArea of the primary server (''
Sometime it can happen that a AE Server Process does not start. In the logs the error message above is displayed.

A second restart a few moments later works again.
Cause type:
Root Cause: The netArea of a new work process is not up to date in the socket list when the Start message of the new work process comes to the primary work process, causing the work process to shut down.
Update to a fix version listed below or a newer version if available.

Fix Status: In Progress

Fix Version(s):
Automation Engine 12.2.0 - Planned release date: 2018-06-19
Automation Engine 12.1.1 - Available
Automation Engine 12.0.5 - Planned release date: 2018-05-07
Automation Engine 11.2.7 - Available
Additional Information:
Workaround :
Restart the server process.