title: ambari-agent can not reach ambari-server
body: <p>When I finished install ambari-server with httpd local repository and Comfire Hosts on webUI, I got some error as follow:</p>
  
  <pre><code>INFO 2018-05-27 15:39:16,776 NetUtil.py:70 - Connecting to https://master:8440/ca
  ERROR 2018-05-27 15:39:16,787 NetUtil.py:96 - [Errno 8] _ssl.c:493: EOF occurred in violation of protocol
  ERROR 2018-05-27 15:39:16,788 NetUtil.py:97 - SSLError: Failed to connect.Please check openssl library versions.
  Refer to: https://bugzilla.redhat.com/show_bug.cgi?id=1022468 for more details.
  WARNING 2018-05-27 15:39:16,789 NetUtil.py:124 - Server at https://master:8440 is not reachable, sleeping for 10 seconds...
  INFO 2018-05-27 15:39:26,793 NetUtil.py:70 - Connecting to https://master:8440/ca
  ERROR 2018-05-27 15:39:26,799 NetUtil.py:96 - [Errno 8] _ssl.c:493: EOF occurred in violation of protocol
  ERROR 2018-05-27 15:39:26,799 NetUtil.py:97 - SSLError: Failed to connect. Please check openssl library versions.Refer to: https://bugzilla.redhat.com/show_bug.cgi?id=1022468 for more details.
  WARNING 2018-05-27 15:39:26,801 NetUtil.py:124 - Server at https://master:8440 is not reachable, sleeping for 10 seconds...
  </code></pre>
  
  <p>My environment message as follow:</p>
  
  <ul>
  <li>CentOS Linux release 7.5.1804 (Core)</li>
  <li>Python2.7.5</li>
  <li>Java1.8.0_171</li>
  <li>OpenSSL1.0.2k</li>
  <li>Ambari2.6.2.0</li>
  <li>HDP-2.6.5.0</li>
  </ul>
  
  <p>On my other amabri-agent nodes, I can reach master on 8440 port as follow:</p>
  
  <pre><code>[root@slave2 ~]# telnet master 8440
  Trying 192.168.17.128...
  Connected to master.
  Escape character is '^]'.
  </code></pre>
  
  <p>Please give me some help, thanks a lot!</p>