Hi, There is currently no solution other than to swith back to rsa authent. In addition this library won't work if you try to use rsa with custom key length (I tried 4096 and it failed). You have to edit the ssh_config on the sftp server in order to disable ed25519 (or at least set rsa with a higher priority) I invite you to watch the ticket on nifi's JIRA https://issues.apache.org/jira/browse/NIFI-5816 Regards ... View more

Another tutorial at this location https://medium.com/@julienlaurenceau/monitoring-nifi-with-graylog-22ef1493310a ... View more