diff --git a/tempest/api/image/v2/test_images.py b/tempest/api/image/v2/test_images.py
index 9e25901..d1f6f98 100644
--- a/tempest/api/image/v2/test_images.py
+++ b/tempest/api/image/v2/test_images.py
@@ -158,7 +158,7 @@
 
         self.client.stage_image_file(
             image['id'],
-            six.BytesIO(data_utils.random_bytes(10485760)))
+            six.BytesIO(data_utils.random_bytes()))
         # Check image status is 'uploading'
         body = self.client.show_image(image['id'])
         self.assertEqual(image['id'], body['id'])
diff --git a/tempest/lib/common/rest_client.py b/tempest/lib/common/rest_client.py
index b47b511..a987e03 100644
--- a/tempest/lib/common/rest_client.py
+++ b/tempest/lib/common/rest_client.py
@@ -104,16 +104,18 @@
                                        'location', 'proxy-authenticate',
                                        'retry-after', 'server',
                                        'vary', 'www-authenticate'))
-        dscv = disable_ssl_certificate_validation
+        self.dscv = disable_ssl_certificate_validation
 
         if proxy_url:
             self.http_obj = http.ClosingProxyHttp(
                 proxy_url,
-                disable_ssl_certificate_validation=dscv, ca_certs=ca_certs,
+                disable_ssl_certificate_validation=self.dscv,
+                ca_certs=ca_certs,
                 timeout=http_timeout, follow_redirects=follow_redirects)
         else:
             self.http_obj = http.ClosingHttp(
-                disable_ssl_certificate_validation=dscv, ca_certs=ca_certs,
+                disable_ssl_certificate_validation=self.dscv,
+                ca_certs=ca_certs,
                 timeout=http_timeout, follow_redirects=follow_redirects)
 
     def get_headers(self, accept_type=None, send_type=None):
diff --git a/tempest/lib/services/object_storage/object_client.py b/tempest/lib/services/object_storage/object_client.py
index 383aff6..1d38153 100644
--- a/tempest/lib/services/object_storage/object_client.py
+++ b/tempest/lib/services/object_storage/object_client.py
@@ -12,6 +12,7 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
+import ssl
 
 from six.moves import http_client as httplib
 from six.moves.urllib import parse as urlparse
@@ -118,7 +119,7 @@
         path = str(parsed.path) + "/"
         path += "%s/%s" % (str(container), str(object_name))
 
-        conn = _create_connection(parsed)
+        conn = self._create_connection(parsed)
         # Send the PUT request and the headers including the "Expect" header
         conn.putrequest('PUT', path)
 
@@ -151,15 +152,20 @@
 
         return resp.status, resp.reason
 
+    def _create_connection(self, parsed_url):
+        """Helper function to create connection with httplib
 
-def _create_connection(parsed_url):
-    """Helper function to create connection with httplib
+        :param parsed_url: parsed url of the remote location
+        """
+        context = None
+        # If CONF.identity.disable_ssl_certificate_validation is true,
+        # do not check ssl certification.
+        if self.dscv:
+            context = ssl._create_unverified_context()
+        if parsed_url.scheme == 'https':
+            conn = httplib.HTTPSConnection(parsed_url.netloc,
+                                           context=context)
+        else:
+            conn = httplib.HTTPConnection(parsed_url.netloc)
 
-    :param parsed_url: parsed url of the remote location
-    """
-    if parsed_url.scheme == 'https':
-        conn = httplib.HTTPSConnection(parsed_url.netloc)
-    else:
-        conn = httplib.HTTPConnection(parsed_url.netloc)
-
-    return conn
+        return conn
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index ce13166..acc563a 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -143,10 +143,20 @@
     # resp part which is not used in scenario tests
 
     def create_port(self, network_id, client=None, **kwargs):
-        """Creates port for the respective network_id"""
+        """Creates port for the respective network_id
+
+        :param network_id: the id of the network
+        :param client: the client to use, defaults to self.ports_client
+        :param kwargs: additional arguments such as:
+            - namestart - a string to generate a name for the port from
+                        - default is self.__class__.__name__
+            - 'binding:vnic_type' - defaults to CONF.network.port_vnic_type
+            - 'binding:profile' - defaults to CONF.network.port_profile
+        """
         if not client:
             client = self.ports_client
-        name = kwargs.pop('namestart', self.__class__.__name__)
+        name = data_utils.rand_name(
+            kwargs.pop('namestart', self.__class__.__name__))
         if CONF.network.port_vnic_type and 'binding:vnic_type' not in kwargs:
             kwargs['binding:vnic_type'] = CONF.network.port_vnic_type
         if CONF.network.port_profile and 'binding:profile' not in kwargs:
@@ -216,6 +226,9 @@
               the port.
               example: port_profile = "capabilities:[switchdev]"
               Defaults to ``CONF.network.port_profile``.
+            * *create_port_body* (``dict``) --
+              This attribute is a dictionary of additional arguments to be
+              passed to create_port method.
         """
 
         # NOTE(jlanoux): As a first step, ssh checks in the scenario
@@ -241,7 +254,7 @@
         # every network
         if vnic_type or profile:
             ports = []
-            create_port_body = {}
+            create_port_body = kwargs.pop('create_port_body', {})
 
             if vnic_type:
                 create_port_body['binding:vnic_type'] = vnic_type
@@ -402,19 +415,17 @@
         self.assertEqual(backup_id, restore['backup_id'])
         return restore
 
-    def rebuild_server(self, server_id, image=None,
-                       preserve_ephemeral=False, wait=True,
-                       rebuild_kwargs=None):
+    def rebuild_server(self, server_id, image=None, preserve_ephemeral=False,
+                       wait=True, **kwargs):
         if image is None:
             image = CONF.compute.image_ref
-        rebuild_kwargs = rebuild_kwargs or {}
         LOG.debug("Rebuilding server (id: %s, image: %s, preserve eph: %s)",
                   server_id, image, preserve_ephemeral)
         self.servers_client.rebuild_server(
             server_id=server_id,
             image_ref=image,
             preserve_ephemeral=preserve_ephemeral,
-            **rebuild_kwargs)
+            **kwargs)
         if wait:
             waiters.wait_for_server_status(self.servers_client,
                                            server_id, 'ACTIVE')
diff --git a/tempest/tests/lib/services/object_storage/test_object_client.py b/tempest/tests/lib/services/object_storage/test_object_client.py
index c646d61..d6df243 100644
--- a/tempest/tests/lib/services/object_storage/test_object_client.py
+++ b/tempest/tests/lib/services/object_storage/test_object_client.py
@@ -31,15 +31,18 @@
         self.object_client = object_client.ObjectClient(self.fake_auth,
                                                         'swift', 'region1')
 
-    @mock.patch.object(object_client, '_create_connection')
+    @mock.patch('tempest.lib.services.object_storage.object_client.'
+                'ObjectClient._create_connection')
     def test_create_object_continue_no_data(self, mock_poc):
         self._validate_create_object_continue(None, mock_poc)
 
-    @mock.patch.object(object_client, '_create_connection')
+    @mock.patch('tempest.lib.services.object_storage.object_client.'
+                'ObjectClient._create_connection')
     def test_create_object_continue_with_data(self, mock_poc):
         self._validate_create_object_continue('hello', mock_poc)
 
-    @mock.patch.object(object_client, '_create_connection')
+    @mock.patch('tempest.lib.services.object_storage.object_client.'
+                'ObjectClient._create_connection')
     def test_create_continue_with_no_continue_received(self, mock_poc):
         self._validate_create_object_continue('hello', mock_poc,
                                               initial_status=201)