Github user markap14 commented on the issue:
https://github.com/apache/nifi/pull/690
@YolandaMDavis I updated the PR with a new commit so that you can see what
changed. It looks like the way to cause it to hit is to drag a connection from
a Processor to the Remote Process Group, and then once the dialog is up to
choose which port, remove the port from a different browser tab, and then wait
30 seconds for the RPG to refresh ports. Then click the "Apply" button on the
"Add Connection" dialog
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