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Engine(s) will transition to a FATAL state or will fail to start throwing the following error in the *_db.logs which can be found in <APPIAN_HOME>/logs/:
"FATAL .a.db "bind: Only one usage of each socket address (protocol/network address/port) is normally permitted."
Windows patch KB4338823 is known to cause network port issues.
Revert to previous Windows patch or install Windows patch KB4345459.
This article applies to all versions of Appian.
Last Reviewed: September 2018