The DCAE fails to deploy the tcagen2 microservice from CLAMP

The status URL returned by DCAE

curl -v --insecure https://deployment-handler.onap:8443/dcae-deployments/CLAMP_fff5b738-0547-42e0-b8b6-5b2451512721/operation/2d566836-c039-4f44-9d3c-6d92c7e17ca8?cfy_tenant_name=default_tenant

returns this error message:

{"operationType":"install","status":"failed","error":"Traceback (most recent call last):\n File \"/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/dispatch.py\", line 673, in _remote_workflow_child_thread\n workflow_result = self._execute_workflow_function()\n File \"/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/dispatch.py\", line 702, in _execute_workflow_function\n result = self.func(*self.args, **self.kwargs)\n File \"/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/plugins/workflows.py\", line 32, in install\n node_instances=set(ctx.node_instances))\n File \"/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/plugins/lifecycle.py\", line 29, in install_node_instances\n processor.install()\n File \"/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/plugins/lifecycle.py\", line 102, in install\n graph.execute()\n File \"/opt/mgmtworker/env/lib/python2.7/site-packages/cloudify/workflows/tasks_graph.py\", line 244, in execute\n raise self._error\n* Connection #0 to host deployment-handler.onap left intact RuntimeError: Workflow failed: Task failed 'dcaepolicyplugin.policy_get' -> failed to get policy(MICROSERVICE_vLB_CDS_Seb_service_v1_0_tcagen2_1_0_0_ib9): HTTPConnectionPool(host='policy-handler', port=80): Max retries exceeded with url: /policy_latest/MICROSERVICE_vLB_CDS_Seb_service_v1_0_tcagen2_1_0_0_ib9 (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7feb320c2790>: Failed to establish a new connection: [Errno -2] Name or service not known',))\n","requestId":"1abd88ca-5ccd-436b-82e3-24b050d8e2fd","links":\{"self":"https://deployment-handler.onap:8443/dcae-deployments/CLAMP_fff5b738-0547-42e0-b8b6-5b2451512721","status":"https://deployment-handler.onap:8443/dcae-deployments/CLAMP_fff5b738-0547-42e0-b8b6-5b2451512721/operation/2d566836-c039-4f44-9d3c-6d92c7e17ca8?cfy_tenant_name=default_tenant"}

}