Hi 

I am getting  "The Cloudera Manager Agent is not able to communicate with this role's web server." error in HDFS, HBASE and YARN services,

rest services are not giving any error.

I am able to execute the code in all services but still getting above error message.  

Following are the logs in "cloudera-scm-agent.log" :

ERROR Failed to collect java-based DNS names
Traceback (most recent call last):
File "/usr/lib/cmf/agent/src/cmf/monitor/host/dns_names.py", line 64, in collect
result, stdout, stderr = self._subprocess_with_timeout(args, self._poll_timeout)
File "/usr/lib/cmf/agent/src/cmf/monitor/host/dns_names.py", line 46, in _subprocess_with_timeout
return subprocess_with_timeout(args, timeout)
File "/usr/lib/cmf/agent/src/cmf/monitor/host/subprocess_timeout.py", line 40, in subprocess_with_timeout
close_fds=True)
File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
errread, errwrite)
File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
raise child_exception

48487 Monitor-DataNodeMonitor throttling_logger ERROR Error fetching metrics at 'http://hdslave01.cibil.com:50075/jmx'
Traceback (most recent call last):
File "/usr/lib/cmf/agent/src/cmf/monitor/abstract_monitor.py", line 399, in collect_metrics_from_url
openedUrl = self.urlopen(url, username=username, password=password)
File "/usr/lib/cmf/agent/src/cmf/monitor/abstract_monitor.py", line 363, in urlopen
password=password)
File "/usr/lib/cmf/agent/src/cmf/url_util.py", line 58, in urlopen_with_timeout
return opener.open(url, data, timeout)
File "/usr/lib/python2.7/urllib2.py", line 406, in open
response = meth(req, response)

File "/usr/lib/python2.7/urllib2.py", line 519, in http_response
'http', request, response, code, msg, hdrs)
File "/usr/lib/python2.7/urllib2.py", line 444, in error
return self._call_chain(*args)
File "/usr/lib/python2.7/urllib2.py", line 378, in _call_chain
result = func(*args)
File "/usr/lib/python2.7/urllib2.py", line 527, in http_error_default
raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 503: Service Unavailable

Correct me if i am wrong, is these error are related to HTTPs server?

I didn't get these error in CDH4.5, after installation fresh copy of CDH5.2 I am getting these error.

Does HBase,HDFS,YARN services requires mandate HTTPS server or TLS configuration, if so how to fix the configuration ?

Thanks in advance