Unable to register CDS to RHUA, it errors out with message, "Error registering xxx.xxx.xxx, check the log file for more information" or "PulpException: Communications error while attempting to initialize CDS"

Issue

• Unable to register CDS to RHUA, it errors out with message, "Error registering xxx.xxx.xxx, check the log file for more information"

• Removed old CDS server from RHUA but while adding CDS server to RHUA using rhui-manager it fails with error "PulpException: Communications error while attempting to initialize CDS [cds.example.com]"

Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/rhui/tools/pulp_api.py", line 725, in register_cds
    cluster_id=cluster_name, client_hostname=client_hostname)
  File "/usr/lib/python2.6/site-packages/pulp/client/api/cds.py", line 35, in register
    return self.server.POST(path, data)[1]
  File "/usr/lib/python2.6/site-packages/pulp/client/api/server.py", line 323, in POST
    return self._request('POST', path, body=body)
  File "/usr/lib/python2.6/site-packages/pulp/client/api/server.py", line 287, in _request
    raise ServerRequestError(response.status, message, traceback)
ServerRequestError: (500, u'PulpException: Communications error while attempting to initialize CDS [cds.example.com]; check the server log for more information', u'Traceback (most recent call last):\n  File "/usr/lib/python2.6/site-packages/pulp/server/webservices/controllers/decorators.py", line 48, in report_error\n    return method(self, *args, **kwargs)\n  File "/usr/lib/python2.6/site-packages/pulp/server/webservices/controllers/decorators.py", line 127, in _auth_decorator\n    value = method(self, *args, **kwargs)\n  File "/usr/lib/python2.6/site-packages/pulp/server/webservices/controllers/cds.py", line 78, in POST\n    sync_schedule=sync_schedule, cluster_id=cluster_id)\n  File "/usr/lib/python2.6/site-packages/pulp/server/api/cds.py", line 131, in register\n    secret = self.dispatcher.init_cds(cds)\n  File "/usr/lib/python2.6/site-packages/pulp/server/cds/dispatcher.py", line 92, in init_cds\n    secret = self._send(self._cds_stub(cds).initialize)\n  File "/usr/lib/python2.6/site-packages/pulp/server/cds/dispatcher.py", line 169, in _send\n    result = func(*args)\n  File "/usr/lib/python2.6/site-packages/gofer/rmi/stub.py", line 72, in __call__\n    return self.stub._send(request, opts)\n  File "/usr/lib/python2.6/site-packages/gofer/rmi/stub.py", line 133, in _send\n    return self.__send(request, options)\n  File "/usr/lib/python2.6/site-packages/gofer/rmi/stub.py", line 164, in __send\n    any=opts.any)\n  File "/usr/lib/python2.6/site-packages/gofer/rmi/policy.py", line 144, in send\n    return self.__getreply(sn, reader)\n  File "/usr/lib/python2.6/site-packages/gofer/rmi/policy.py", line 181, in __getreply\n    return self.__onreply(envelope)\n  File "/usr/lib/python2.6/site-packages/gofer/rmi/policy.py", line 197, in __onreply\n    raise RemoteException.instance(reply)')