@Law  serveraddress is hostname of host where nifi service is installed. E.g you have installed it on samplehost.com then it would be "http://samplehost.com:8080/nifi" .If you enable SSL for nifi later then the URL will change to "https://samplehost.com:<secure_port>/nifi". Also you should check that host and port are reachable from your browser to access NiFi UI.       If this answer resolves your issue or allows you to move forward, please choose to ACCEPT this solution and close this topic. If you have further dialogue on this topic please comment here.   -Akash ... View more