diff --git a/tempest/api/object_storage/test_object_formpost.py b/tempest/api/object_storage/test_object_formpost.py
index e0d15ac..81db252 100644
--- a/tempest/api/object_storage/test_object_formpost.py
+++ b/tempest/api/object_storage/test_object_formpost.py
@@ -39,6 +39,18 @@
         cls.metadata = {'Temp-URL-Key': cls.key}
         cls.account_client.create_account_metadata(metadata=cls.metadata)
 
+    def setUp(self):
+        super(ObjectFormPostTest, self).setUp()
+
+        # make sure the metadata has been set
+        account_client_metadata, _ = \
+            self.account_client.list_account_metadata()
+        self.assertIn('x-account-meta-temp-url-key',
+                      account_client_metadata)
+        self.assertEqual(
+            account_client_metadata['x-account-meta-temp-url-key'],
+            self.key)
+
     @classmethod
     def tearDownClass(cls):
         cls.account_client.delete_account_metadata(metadata=cls.metadata)
@@ -100,13 +112,9 @@
         headers = {'Content-Type': content_type,
                    'Content-Length': str(len(body))}
 
-        url = "%s/%s/%s" % (self.container_client.base_url,
-                            self.container_name,
-                            self.object_name)
+        url = "%s/%s" % (self.container_name, self.object_name)
 
-        # Use a raw request, otherwise authentication headers are used
-        resp, body = self.object_client.http_obj.request(url, "POST",
-                                                         body, headers=headers)
+        resp, body = self.object_client.post(url, body, headers=headers)
         self.assertIn(int(resp['status']), test.HTTP_SUCCESS)
         self.assertHeaders(resp, "Object", "POST")
 
diff --git a/tempest/api/object_storage/test_object_formpost_negative.py b/tempest/api/object_storage/test_object_formpost_negative.py
index a52c248..fe0c994 100644
--- a/tempest/api/object_storage/test_object_formpost_negative.py
+++ b/tempest/api/object_storage/test_object_formpost_negative.py
@@ -20,6 +20,7 @@
 
 from tempest.api.object_storage import base
 from tempest.common.utils import data_utils
+from tempest import exceptions
 from tempest import test
 
 
@@ -38,6 +39,18 @@
         cls.metadata = {'Temp-URL-Key': cls.key}
         cls.account_client.create_account_metadata(metadata=cls.metadata)
 
+    def setUp(self):
+        super(ObjectFormPostNegativeTest, self).setUp()
+
+        # make sure the metadata has been set
+        account_client_metadata, _ = \
+            self.account_client.list_account_metadata()
+        self.assertIn('x-account-meta-temp-url-key',
+                      account_client_metadata)
+        self.assertEqual(
+            account_client_metadata['x-account-meta-temp-url-key'],
+            self.key)
+
     @classmethod
     def tearDownClass(cls):
         cls.account_client.delete_account_metadata(metadata=cls.metadata)
@@ -100,12 +113,25 @@
         headers = {'Content-Type': content_type,
                    'Content-Length': str(len(body))}
 
-        url = "%s/%s/%s" % (self.container_client.base_url,
-                            self.container_name,
-                            self.object_name)
+        url = "%s/%s" % (self.container_name, self.object_name)
+        exc = self.assertRaises(
+            exceptions.Unauthorized,
+            self.object_client.post,
+            url, body, headers=headers)
+        self.assertIn('FormPost: Form Expired', str(exc))
 
-        # Use a raw request, otherwise authentication headers are used
-        resp, body = self.object_client.http_obj.request(url, "POST",
-                                                         body, headers=headers)
-        self.assertEqual(int(resp['status']), 401)
-        self.assertIn('FormPost: Form Expired', body)
+    @test.requires_ext(extension='formpost', service='object')
+    @test.attr(type='gate')
+    def test_post_object_using_form_invalid_signature(self):
+        self.key = "Wrong"
+        body, content_type = self.get_multipart_form()
+
+        headers = {'Content-Type': content_type,
+                   'Content-Length': str(len(body))}
+
+        url = "%s/%s" % (self.container_name, self.object_name)
+        exc = self.assertRaises(
+            exceptions.Unauthorized,
+            self.object_client.post,
+            url, body, headers=headers)
+        self.assertIn('FormPost: Invalid Signature', str(exc))
diff --git a/tempest/common/rest_client.py b/tempest/common/rest_client.py
index 830968e..23563b5 100644
--- a/tempest/common/rest_client.py
+++ b/tempest/common/rest_client.py
@@ -481,7 +481,7 @@
             raise exceptions.InvalidContentType(str(resp.status))
 
         if resp.status == 401 or resp.status == 403:
-            raise exceptions.Unauthorized()
+            raise exceptions.Unauthorized(resp_body)
 
         if resp.status == 404:
             raise exceptions.NotFound(resp_body)