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https://issues.apache.org/jira/browse/NIFI-10369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17607963#comment-17607963
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Nikolay Akimov commented on NIFI-10369:
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It turned out that I interrupted the work without finishing the configuration 
of the processors. I turned off the NiFi instance and it could no longer start. 
This is a big problem. I would not wish anyone to face such a situation in a 
responsible (working) environment.
Of course, I would prefer a warning in the log about such an error in the 
configuration than not starting the engine.

> Apache NiFi 1.16.x windows server closes immediately
> ----------------------------------------------------
>
>                 Key: NIFI-10369
>                 URL: https://issues.apache.org/jira/browse/NIFI-10369
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Examples
>    Affects Versions: 1.16.3
>         Environment: Windows, Linux
>            Reporter: Nikolay Akimov
>            Priority: Critical
>              Labels: test-stability
>         Attachments: Output_Port.xml, testRemote.xml
>
>
> When I try to restart the server it's throwing with the following error 
> message.
> *org.apache.nifi.controller.serialization.FlowSynchronizationException: 
> java.lang.IllegalStateException: Cannot add Connection to Process Group 
> because source is an Output Port that does not belong to a child Process 
> Group*
>  
> I have simplified the scenario to such an extent that it is reproducible. I 
> attach the file. After importing this file and if you place the template on 
> the canvas, WiFi does not start after the restart.
>  
>  



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