SDN Node failed: Failed to get subnet for this host: hostname.example.com, error: hostsubnet "hostname.example.com" not found

Issue

• When installing OSE 3.1, it gets failed at the task :

TASK: [openshift_manage_node | Wait for Node Registration] ********************
failed: [Master_IP] => (item=Master_name.example.com) => {"attempts": 20, "changed": true, "cmd": ["oc", "get", "node", "Master_name.example.com"], "delta": "0:00:00.294432", "end": "2016-07-01 19:03:26.983200", "failed": true, "item": "Master_name.example.com", "rc": 1, "start": "2016-07-01 19:03:26.688768", "warnings": []}
stderr: Error from server: node "Master_name.example.com" not found
msg: Task failed as maximum retries was encountered
failed: [Master_IP] => (item=Slave_name.example.com) => {"attempts": 20, "changed": true, "cmd": ["oc", "get", "node", "Slave_name.example.com"], "delta": "0:00:00.293134", "end": "2016-07-01 19:05:16.265200", "failed": true, "item": "Slave_name.example.com", "rc": 1, "start": "2016-07-01 19:05:15.972066", "warnings": []}
stderr: Error from server: node "Slave_name.example.com" not found
msg: Task failed as maximum retries was encountered

FATAL: all hosts have already failed -- aborting

PLAY RECAP ********************************************************************
           to retry, use: --limit @/root/config.retry

Slave_IP              : ok=57   changed=20   unreachable=0    failed=0
Master_IP              : ok=204  changed=58   unreachable=0    failed=1
localhost                  : ok=11   changed=0    unreachable=0    failed=0

Where are you experiencing the behavior? What environment?

Our Environment details are as follows:
1. Internal DNS hosted on a Linux VM for Name resolution.
2. 1 Master and 1 Node VM(both RHEL 7.2)
3.All the servers are not exposed to the internet directly. There is a corporate Proxy through which we access the internet.

• Logs show -

Jul 05 19:11:39 hostname.example.com atomic-openshift-node[26337]: F0705 19:11:39.939971   26337 flatsdn.go:42] SDN Node failed: Failed to get subnet for this host: hostname.example.com, error: hostsubnet "hostname.example.com" not found