@Sami Ahmad the format for kerberos principal is primary/instance@REALM . For admin principals typically the instance is admin. If the REALM is not specified than the default one will be used. Try passing admin/admin into the "Admin principal" field. ... View more

Just tested the below in my local environment and worked fine: curl -u admin:admin -H "X-Requested-By: ambari" -d '{"RequestInfo":{"context":"Stop Flume agent","flume_handler":"agent","operation_level":{"level":"HOST_COMPONENT","cluster_name":"Cluster","service_name":"FLUME","host_name":"node5"}},"Body":{"HostRoles":{"state":"INSTALLED"}}}' -X PUT "http://node1:8080/api/v1/clusters/Cluster/hosts/node5/host_components/FLUME_HANDLER" ... View more