Nuage: metadata agent does not work with ssh key

ssh to VM failed with ssh key due to not able to communicate with metadata agent. After the deployment, nuage-metadata-agent service did not run on nuage-vrsg/0. I started this service but still get the same error.

$ ssh -i ~/ashleykey.pem ubuntu@10.244.7.4
The authenticity of host '10.244.7.4 (10.244.7.4)' can't be established.
ECDSA key fingerprint is 3b:db:4b:a2:91:66:6f:1f:fe:ca:e7:a8:f7:b1:54:9b.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '10.244.7.4' (ECDSA) to the list of known hosts.
Permission denied (publickey).

nova console-log:
...
2016-02-22 19:09:58,237 - url_helper.py[WARNING]: Calling
'http://192.168.20.1//latest/meta-data/instance-id' failed [101/120s]:
request error [(<urllib3.connectionpool.HTTPConnectionPool object at
0x7f4cf3f36310>, 'Connection to 192.168.20.1 timed out. (connect
timeout=50.0)')]
2016-02-22 19:10:16,259 - url_helper.py[WARNING]: Calling
'http://192.168.20.1//latest/meta-data/instance-id' failed [119/120s]:
request error [(<urllib3.connectionpool.HTTPConnectionPool object at
0x7f4cf3f36290>, 'Connection to 192.168.20.1 timed out. (connect
timeout=17.0)')]
2016-02-22 19:10:17,261 - DataSourceCloudStack.py[CRITICAL]: Giving up
on waiting for the metadata from
['http://192.168.20.1//latest/meta-data/instance-id'] after 120
seconds
Feb 22 19:10:17 ubuntu pollinate[716]: ERROR: Network communication
failed [6]\n19:10:17.377791 * Hostname was NOT found in DNS cache
  % Total % Received % Xferd Average Speed Time Time Time Current
                                 Dload Upload Total Spent Left Speed
  0 0 0 0 0 0 0 0 --:--:-- --:--:--
--:--:-- 019:10:17.382893 * Could not resolve host:
entropy.ubuntu.com
19:10:17.383020 * Closing connection 0
curl: (6) Could not resolve host: entropy.ubuntu.com
...