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Problem(Abstract)
Your IBM Informix server instance terminated unexpectedly. There is no message in server log file (online.log) indicating that it came offline.
Diagnosing the problem
Check your system for a file named olsrvice.log (not olservice.log). You may find the file in the Informix server directory, C:\WINDOWS\system32, or possibly another directory. If the file contains the message that follows, then the server was not brought offline by terminating the database server service.
<timestamp> Service was shut-down externally.
You should be able to mimic this behavior by executing a taskkill command to kill oninit.exe:
>taskkill /F /IM oninit.exe /T
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