diff --git a/tempest/api/network/admin/test_negative_quotas.py b/tempest/api/network/admin/test_negative_quotas.py
index c256b5b..beb6ce6 100644
--- a/tempest/api/network/admin/test_negative_quotas.py
+++ b/tempest/api/network/admin/test_negative_quotas.py
@@ -57,8 +57,7 @@
         # Try to create a third network while the quota is two
         with self.assertRaisesRegex(
                 lib_exc.Conflict,
-                "An object with that identifier already exists\\n" +
-                "Details.*Quota exceeded for resources: \['network'\].*"):
+                "Quota exceeded for resources: \['network'\].*"):
             n3 = self.networks_client.create_network()
             self.addCleanup(self.networks_client.delete_network,
                             n3['network']['id'])
diff --git a/tempest/api/network/test_dhcp_ipv6.py b/tempest/api/network/test_dhcp_ipv6.py
index 84c48ec..b4dcb35 100644
--- a/tempest/api/network/test_dhcp_ipv6.py
+++ b/tempest/api/network/test_dhcp_ipv6.py
@@ -340,7 +340,7 @@
                              {'subnet_id': subnet['id'],
                               'ip_address': ip}])
         self.assertRaisesRegex(lib_exc.Conflict,
-                               "object with that identifier already exists",
+                               "IpAddressAlreadyAllocated|IpAddressInUse",
                                self.create_port,
                                self.network,
                                fixed_ips=[{'subnet_id': subnet['id'],
diff --git a/tempest/api/object_storage/test_container_services_negative.py b/tempest/api/object_storage/test_container_services_negative.py
index f63c518..2856fab 100644
--- a/tempest/api/object_storage/test_container_services_negative.py
+++ b/tempest/api/object_storage/test_container_services_negative.py
@@ -173,5 +173,5 @@
         ex = self.assertRaises(exceptions.Conflict,
                                self.container_client.delete_container,
                                container_name)
-        self.assertIn('An object with that identifier already exists',
-                      str(ex))
+        self.assertIn('There was a conflict when trying to complete your '
+                      'request.', str(ex))