diff --git a/translator/hot/tosca/tests/test_tosca_compute.py b/translator/hot/tosca/tests/test_tosca_compute.py
index f9563443..119dc3a1 100644
--- a/translator/hot/tosca/tests/test_tosca_compute.py
+++ b/translator/hot/tosca/tests/test_tosca_compute.py
@@ -251,3 +251,35 @@ class ToscaComputeTest(TestCase):
             self._tosca_compute_test(
                 tpl_snippet,
                 expectedprops)
+
+    @patch('requests.post')
+    @patch('requests.get')
+    @patch('os.getenv')
+    def test_node_compute_without_nova_flavor(self, mock_os_getenv,
+                                              mock_get, mock_post):
+        tpl_snippet = '''
+        node_templates:
+          server:
+            type: tosca.nodes.Compute
+            capabilities:
+              host:
+                properties:
+                  num_cpus: 1
+                  disk_size: 1 GB
+                  mem_size: 1 GB
+        '''
+        with patch('translator.hot.tosca.tosca_compute.ToscaCompute.'
+                   '_check_for_env_variables') as mock_check_env:
+            mock_check_env.return_value = True
+            mock_os_getenv.side_effect = ['demo', 'demo',
+                                          'demo', 'http://abc.com/5000/']
+            mock_ks_response = mock.MagicMock()
+            mock_ks_content = {}
+            mock_ks_response.content = json.dumps(mock_ks_content)
+            expectedprops = {'key_name': 'userkey',
+                             'flavor': 'm1.small',
+                             'user_data_format': 'SOFTWARE_CONFIG',
+                             'image': None}
+            self._tosca_compute_test(
+                tpl_snippet,
+                expectedprops)
diff --git a/translator/hot/tosca/tosca_compute.py b/translator/hot/tosca/tosca_compute.py
index fcb0a1dd..dde3ab63 100755
--- a/translator/hot/tosca/tosca_compute.py
+++ b/translator/hot/tosca/tosca_compute.py
@@ -20,6 +20,7 @@ from toscaparser.utils.gettextutils import _
 from toscaparser.utils.validateutils import TOSCAVersionProperty
 import translator.common.utils
 from translator.hot.syntax.hot_resource import HotResource
+
 log = logging.getLogger('heat-translator')
 
 
@@ -145,33 +146,40 @@ class ToscaCompute(HotResource):
             }
         }
         headers = {'Content-Type': 'application/json'}
-        keystone_response = requests.post(auth_url + '/tokens',
-                                          data=json.dumps(auth_dict),
-                                          headers=headers)
-        if keystone_response.status_code != 200:
+        try:
+            keystone_response = requests.post(auth_url + '/tokens',
+                                              data=json.dumps(auth_dict),
+                                              headers=headers)
+            if keystone_response.status_code != 200:
+                return None
+            access_dict = json.loads(keystone_response.content)
+            access_token = access_dict['access']['token']['id']
+            service_catalog = access_dict['access']['serviceCatalog']
+            nova_url = ''
+            for service in service_catalog:
+                if service['type'] == 'compute':
+                    nova_url = service['endpoints'][0]['publicURL']
+            if not nova_url:
+                return None
+            nova_response = requests.get(nova_url + '/flavors/detail',
+                                         headers={'X-Auth-Token':
+                                                  access_token})
+            if nova_response.status_code != 200:
+                return None
+            flavors = json.loads(nova_response.content)['flavors']
+            flavor_dict = dict()
+            for flavor in flavors:
+                flavor_name = str(flavor['name'])
+                flavor_dict[flavor_name] = {
+                    'mem_size': flavor['ram'],
+                    'disk_size': flavor['disk'],
+                    'num_cpus': flavor['vcpus'],
+                }
+        except Exception as e:
+            # Handles any exception coming from openstack
+            log.warn(_('Choosing predefined flavors since received '
+                       'Openstack Exception: %s') % str(e))
             return None
-        access_dict = json.loads(keystone_response.content)
-        access_token = access_dict['access']['token']['id']
-        service_catalog = access_dict['access']['serviceCatalog']
-        nova_url = ''
-        for service in service_catalog:
-            if service['type'] == 'compute':
-                nova_url = service['endpoints'][0]['publicURL']
-        if not nova_url:
-            return None
-        nova_response = requests.get(nova_url + '/flavors/detail',
-                                     headers={'X-Auth-Token': access_token})
-        if nova_response.status_code != 200:
-            return None
-        flavors = json.loads(nova_response.content)['flavors']
-        flavor_dict = dict()
-        for flavor in flavors:
-            flavor_name = str(flavor['name'])
-            flavor_dict[flavor_name] = {
-                'mem_size': flavor['ram'],
-                'disk_size': flavor['disk'],
-                'num_cpus': flavor['vcpus'],
-            }
         return flavor_dict
 
     def _best_flavor(self, properties):