Event ID - 1020

Event Id1020
SourceCiscoUnity_Arbiter
Description[%1] StopIO() call on port failed. Unity will not be stopped from shutting down.
Event Information"According To Cisco:
Condition:

In Cisco Unity version 3.1.5/4.0.1, this may happen if the Unity process ""AvCsMgr"" leaks Virtual bytes. If the virtual bytes exceeds the recommended limits on an Unity system, the subscriber may possibly see unexpected system behavior and error events in the application event log. This happens only on high end systems with a high user/port number and under heavy call traffic

Workaround:
The workaround is to restart the Unity server"
Reference LinksCisco Unity Error Message Finder

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