Registering a RHEL Host to Red Hat Satellite 6 fails with error "Unable to verify server's identity: tlsv1 alert protocol version"

Issue

• Registering an RHEL 6 Host to Red Hat Satellite 6 fails with the error:

  2020-03-10 22:28:08,294 [ERROR] subscription-manager @managercli.py:154 - Error during registration: tlsv1 alert protocol version
  2020-03-10 22:28:08,295 [ERROR] subscription-manager @managercli.py:155 - tlsv1 alert protocol version
  Traceback (most recent call last):
  File "/usr/share/rhsm/subscription_manager/managercli.py", line 1044, in _do_command
  installed_products=self.installed_mgr.format_for_server())
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 738, in registerConsumer
  return self.conn.request_post(url, params)
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 553, in request_post
  return self._request("POST", method, params)
  File "/usr/lib64/python2.6/site-packages/rhsm/connection.py", line 453, in _request
  conn.request(request_type, handler, body=body, headers=headers)
  File "/usr/lib64/python2.6/httplib.py", line 914, in request
  self._send_request(method, url, body, headers)
  File "/usr/lib64/python2.6/httplib.py", line 951, in _send_request
  self.endheaders()
  File "/usr/lib64/python2.6/httplib.py", line 908, in endheaders
  self._send_output()
  File "/usr/lib64/python2.6/httplib.py", line 780, in _send_output
  self.send(msg)
  File "/usr/lib64/python2.6/httplib.py", line 739, in send
  self.connect()
  File "/usr/lib64/python2.6/site-packages/M2Crypto/httpslib.py", line 58, in connect
  sock.connect((self.host, self.port))
  File "/usr/lib64/python2.6/site-packages/M2Crypto/SSL/Connection.py", line 185, in connect
  ret = self.connect_ssl()
  File "/usr/lib64/python2.6/site-packages/M2Crypto/SSL/Connection.py", line 178, in connect_ssl
  return m2.ssl_connect(self.ssl, self._timeout)
  SSLError: tlsv1 alert protocol version