diff --git a/mistral/api/controllers/v2/service.py b/mistral/api/controllers/v2/service.py
index 4413875b..4c5bbc80 100644
--- a/mistral/api/controllers/v2/service.py
+++ b/mistral/api/controllers/v2/service.py
@@ -15,6 +15,8 @@
 from oslo_config import cfg
 from oslo_log import log as logging
 from pecan import rest
+import six
+import tooz.coordination
 from wsme import types as wtypes
 import wsmeext.pecan as wsme_pecan
 
@@ -72,11 +74,19 @@ class ServicesController(rest.RestController):
         services_list = []
         service_group = ['%s_group' % i for i in launch.LAUNCH_OPTIONS]
 
-        for group in service_group:
-            members = service_coordinator.get_members(group)
-            services_list.extend(
-                [Service.from_dict({'type': group, 'name': member})
-                 for member in members]
+        try:
+            for group in service_group:
+                members = service_coordinator.get_members(group)
+                services_list.extend(
+                    [Service.from_dict({'type': group, 'name': member})
+                     for member in members]
+                )
+        except tooz.coordination.ToozError as e:
+            # In the scenario of network interruption or manually shutdown
+            # connection shutdown, ToozError will be raised.
+            raise exc.CoordinationException(
+                "Failed to get service members from coordination backend. %s"
+                % six.text_type(e)
             )
 
         return Services(services=services_list)
diff --git a/mistral/coordination.py b/mistral/coordination.py
index c2076eed..d8697068 100644
--- a/mistral/coordination.py
+++ b/mistral/coordination.py
@@ -93,6 +93,8 @@ class ServiceCoordinator(object):
             LOG.exception('Error sending a heartbeat to coordination '
                           'backend. %s', six.text_type(e))
 
+            self._started = False
+
     @retry(stop_max_attempt_number=5)
     def join_group(self, group_id):
         if not self.is_active() or not group_id:
@@ -133,6 +135,11 @@ class ServiceCoordinator(object):
             )
 
     def get_members(self, group_id):
+        """Gets members of coordination group.
+
+        ToozError exception must be handled when this function is invoded, we
+        leave it to the invoker for the handling decision.
+        """
         if not self.is_active():
             return []
 
diff --git a/mistral/tests/unit/api/v2/test_services.py b/mistral/tests/unit/api/v2/test_services.py
index 3665122b..1d138502 100644
--- a/mistral/tests/unit/api/v2/test_services.py
+++ b/mistral/tests/unit/api/v2/test_services.py
@@ -12,7 +12,9 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
+import mock
 from oslo_config import cfg
+import tooz.coordination
 from webtest import app as webtest_app
 
 from mistral import coordination
@@ -38,7 +40,7 @@ class TestServicesController(base.FunctionalTest):
         srv_ret = [{"name": "service1", "type": "api_group"}]
         self.assertItemsEqual(srv_ret, resp.json['services'])
 
-    def test_get_all_raise(self):
+    def test_get_all_without_backend(self):
         cfg.CONF.set_default('backend_url', None, 'coordination')
 
         coordination.cleanup_service_coordinator()
@@ -51,3 +53,22 @@ class TestServicesController(base.FunctionalTest):
         )
 
         self.assertIn('Service API is not supported', context.message)
+
+    @mock.patch('mistral.coordination.ServiceCoordinator.get_members',
+                side_effect=tooz.coordination.ToozError('error message'))
+    def test_get_all_with_get_members_error(self, mock_get_members):
+        cfg.CONF.set_default('backend_url', 'zake://', 'coordination')
+
+        coordination.cleanup_service_coordinator()
+        coordination.get_service_coordinator()
+
+        context = self.assertRaises(
+            webtest_app.AppError,
+            self.app.get,
+            '/v2/services',
+        )
+
+        self.assertIn(
+            'Failed to get service members from coordination backend',
+            context.message
+        )