https://community.cloudera.com/t5/Support-Questions/All-Nodes-are-disconnected-from-NiFI-Cluster/m-p/187399#M149500 <P>I should have said that this was using the embedded option for the coordinator. I managed to find the solution by way of an old mailinglist thread (from 2016) [1] that suggested starting the nodes at the same time, rather than one after the other. The reason is that if you start up one node, it will go into a connection frenzy failing to contact the other nodes, quickly hitting the connection limit (and leaving lots of dangling connections in "close wait" state).</P><P><BR /></P><P>[1] <A rel="noopener noreferrer noopener noreferrer" href="http://apache-nifi.1125220.n5.nabble.com/Zookeeper-error-td13355.html" target="_blank">http://apache-nifi.1125220.n5.nabble.com/Zookeeper-error-td13355.html</A></P> Wed, 14 Aug 2019 19:26:12 GMT xalrc 2019-08-14T19:26:12Z