What is the port used by the NodeManager. Check the nodeManager is up and running and also logs for any issues reported. What is the Ambari version? there are known issues of false alerts being reported prior to Ambari 2.4/2.5 releases. ... View more

@Radhia BEZZINE The ErrorCode : 111 [ Connection refused] means that either there is no server or the connection is blocked by firewall. Here the issue seems to be that the ambari-agent running on the server is unable to connect to the ndoemanager on the machine and perform a health-check. Points to check: Check if the node-manager is running on the Machine tconglobal.com and in port 8042. For instance , you can use "netstat -tunlp |grep 8042" command, to know the PID of the java process that is listening on this port and the status. Then use command "ps -ef|grep <pid>" to know the actual process that is listening on the port, if it is nodemanager. You can also check if the nodemanager is running with below command and validate the PID accessing the port. >ps -ef|grep nodemanager Check if the Hostname is correctly resolved from the server where the script is run. Run telnet command from the machine, where script is executed from and check if hostname is resolved and port is accessible. >telnet <hostname> <port> Check the nodemanager log for error message or issues logged , if any issue with nodemanager process. ... View more