Possibly related to https://issues.apache.org/jira/browse/NIFI-14462 I suggest reviewing discussion in this Apache Jira and reviewing your "nifi.web.request.timeout" setting in the nifi.properties file. Making adjustments to this setting may help here. Please help our community grow. If you found any of the suggestions/solutions provided helped you with solving your issue or answering your question, please take a moment to login and click "Accept as Solution" on one or more of them that helped. Thank you, Matt ... View more

Based on the initial input in the question, slightly adapted the following seems to work for me (1.27.0) docker run --rm --name nifi -p 8080:8080 \ -e NIFI_WEB_HTTP_PORT=8080 \ -e NIFI_WEB_HTTPS_PORT= \ -e NIFI_WEB_HTTPS_HOST= \ -e NIFI_SECURITY_KEYSTORE= \ -e NIFI_SECURITY_KEYSTOREPASSWD= \ -e NIFI_SECURITY_KEYPASSWD= \ -e NIFI_SECURITY_TRUSTSTORE= \ -e NIFI_SECURITY_TRUSTSTOREPASSWD= \ apache/nifi:1.27.0 --- --- from container nifi@xxxxxxxxxxxx:/opt/nifi/nifi-toolkit-current/bin$ ./cli.sh _ ___ _ Apache (_) .' ..](_) , _ .--. __ _| |_ __ )\ [ `.-. | [ |'-| |-'[ | / \ | | | | | | | | | | ' ' [___||__][___][___] [___]', ,' `' CLI v1.27.0 Type 'help' to see a list of available commands, use tab to auto-complete. Session loaded from /home/nifi/.nifi-cli.config #> nifi get-root-id xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ... View more