Hi @Vinicius Higa Murakami, No Actually i have created new cluster thats why you are seeing two different hostnames. Below are host file entries 127.0.0.1 localhost.localdomain localhost ::1 localhost6.localdomain6 localhost6 10.162.96.45 temp.tem1.org [root@jazz1 ~]# cat /etc/sysconfig/network # Created by cloud-init on instance boot automatically, do not edit. # NETWORKING=yes hostname=temp.tem1.org [root@jazz1 ~]# hostname --fqdn temp.tem1.org Above are all the required information. However, i am still getting below error and also Nodemanager is going down again NodeManager WEbUI Connection failed to http://temp.tem1.org:8042 (<urlopen error [Errno 111] Connection refused>) NodeManager Health Connection failed to http://temp.tem1.org:8042/ws/v1/node/info (Traceback (most recent call last): File "/var/lib/ambari-agent/cache/common-services/YARN/2.1.0.2.0/package/alerts/alert_nodemanager_health.py", line 171, in execute url_response = urllib2.urlopen(query, timeout=connection_timeout) File "/usr/lib64/python2.7/urllib2.py", line 154, in urlopen return opener.open(url, data, timeout) File "/usr/lib64/python2.7/urllib2.py", line 431, in open response = self._open(req, data) File "/usr/lib64/python2.7/urllib2.py", line 449, in _open '_open', req) File "/usr/lib64/python2.7/urllib2.py", line 409, in _call_chain result = func(*args) File "/usr/lib64/python2.7/urllib2.py", line 1244, in http_open return self.do_open(httplib.HTTPConnection, req) File "/usr/lib64/python2.7/urllib2.py", line 1214, in do_open raise URLError(err) URLError: <urlopen error [Errno 111] Connection refused> ) ... View more