@Bern  I suggest starting a new community question with the full error stack trace you are seeing.  Your exception seems different then the one discussed in this community question:   Failure is due to java.lang.IllegalArgumentException: A HostProvider may not be empty!: java.lang.IllegalArgumentException: A HostProvider may not be empty!   You exception is:   Failure is due to org.apache.nifi.processor.exception.TerminatedTaskException:   A few observations and things you may want to provide details around in your new community post: 1. The version of Apache NiFi you are using was released ~6 years ago.  You should really consider upgrading to take advantage of lost of bug fixes, performance improvements, new features, and security CVEs addressed.  The latest release in the 1.x branch is 1.28 (which is final release of 1.x branch). 2. Your screenshot shows over 250,000 queued FlowFiles (25.75 GB) and 1.373 running processors components. What do you have set as your Max Rimer Driven Tread count? 3. Any other WARN or ERROR messages in your NiFi logs?  Any Out of Memory (OOM) reported? 4. It does not make sense why you are load-balancing in so many connections? Thank you, Matt ... View more