2017-02-09 15:50:29,191 - Error downloading DBConnectionVerification.jar from Ambari Server resources. Check network access to Ambari Server.
HTTP Error 503: Service Unavailable
Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/custom_actions/scripts/check_host.py", line 395, in execute_db_connection_check
    download_file(check_db_connection_url, check_db_connection_path)
  File "/usr/lib/python2.6/site-packages/ambari_commons/inet_utils.py", line 57, in download_file
    force_download_file(link, destination, chunk_size, progress_func = progress_func)
  File "/usr/lib/python2.6/site-packages/ambari_commons/inet_utils.py", line 125, in force_download_file
    response = urllib2.urlopen(request)
  File "/usr/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 448, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 531, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 503: Service Unavailable
2017-02-09 15:50:29,193 - Check db_connection_check was unsuccessful. Exit code: 1. Message: Error downloading DBConnectionVerification.jar from Ambari Server resources. Check network access to Ambari Server.
HTTP Error 503: Service Unavailable

Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/custom_actions/scripts/check_host.py", line 506, in <module>
    CheckHost().execute()
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 280, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/custom_actions/scripts/check_host.py", line 206, in actionexecute
    raise Fail(error_message)
resource_management.core.exceptions.Fail: Check db_connection_check was unsuccessful. Exit code: 1. Message: Error downloading DBConnectionVerification.jar from Ambari Server resources. Check network access to Ambari Server.
HTTP Error 503: Service Unavailable

stdout:  

2017-02-09 15:50:29,067 - Host checks started.
2017-02-09 15:50:29,068 - Check execute list: db_connection_check
2017-02-09 15:50:29,068 - DB connection check started.
2017-02-09 15:50:29,191 - Error downloading DBConnectionVerification.jar from Ambari Server resources. Check network access to Ambari Server.
HTTP Error 503: Service Unavailable
Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/custom_actions/scripts/check_host.py", line 395, in execute_db_connection_check
    download_file(check_db_connection_url, check_db_connection_path)
  File "/usr/lib/python2.6/site-packages/ambari_commons/inet_utils.py", line 57, in download_file
    force_download_file(link, destination, chunk_size, progress_func = progress_func)
  File "/usr/lib/python2.6/site-packages/ambari_commons/inet_utils.py", line 125, in force_download_file
    response = urllib2.urlopen(request)
  File "/usr/lib/python2.7/urllib2.py", line 127, in urlopen
    return _opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 410, in open
    response = meth(req, response)
  File "/usr/lib/python2.7/urllib2.py", line 523, in http_response
    'http', request, response, code, msg, hdrs)
  File "/usr/lib/python2.7/urllib2.py", line 448, in error
    return self._call_chain(*args)
  File "/usr/lib/python2.7/urllib2.py", line 382, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 531, in http_error_default
    raise HTTPError(req.get_full_url(), code, msg, hdrs, fp)
HTTPError: HTTP Error 503: Service Unavailable
2017-02-09 15:50:29,193 - Host checks completed.
2017-02-09 15:50:29,193 - Check db_connection_check was unsuccessful. Exit code: 1. Message: Error downloading DBConnectionVerification.jar from Ambari Server resources. Check network access to Ambari Server.
HTTP Error 503: Service Unavailable

Command failed after 1 tries