diff --git a/tempest/clients.py b/tempest/clients.py
index c75bef5..e1b6eab 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -227,7 +227,7 @@
             endpoint_type=CONF.data_processing.endpoint_type,
             **self.default_params_with_timeout_values)
         self.negative_client = negative_rest_client.NegativeRestClient(
-            self.auth_provider, service)
+            self.auth_provider, service, **self.default_params)
 
         # Generating EC2 credentials in tempest is only supported
         # with identity v2
diff --git a/tempest/common/negative_rest_client.py b/tempest/common/negative_rest_client.py
index a02e494..abd8b31 100644
--- a/tempest/common/negative_rest_client.py
+++ b/tempest/common/negative_rest_client.py
@@ -25,25 +25,39 @@
     """
     Version of RestClient that does not raise exceptions.
     """
-    def __init__(self, auth_provider, service):
-        region = self._get_region(service)
-        super(NegativeRestClient, self).__init__(auth_provider,
-                                                 service, region)
+    def __init__(self, auth_provider, service,
+                 build_interval=None, build_timeout=None,
+                 disable_ssl_certificate_validation=None,
+                 ca_certs=None, trace_requests=None):
+        region, endpoint_type = self._get_region_and_endpoint_type(service)
+        super(NegativeRestClient, self).__init__(
+            auth_provider,
+            service,
+            region,
+            endpoint_type=endpoint_type,
+            build_interval=build_interval,
+            build_timeout=build_timeout,
+            disable_ssl_certificate_validation=(
+                disable_ssl_certificate_validation),
+            ca_certs=ca_certs,
+            trace_requests=trace_requests)
 
-    def _get_region(self, service):
+    def _get_region_and_endpoint_type(self, service):
         """
         Returns the region for a specific service
         """
         service_region = None
+        service_endpoint_type = None
         for cfgname in dir(CONF._config):
             # Find all config.FOO.catalog_type and assume FOO is a service.
             cfg = getattr(CONF, cfgname)
             catalog_type = getattr(cfg, 'catalog_type', None)
             if catalog_type == service:
                 service_region = getattr(cfg, 'region', None)
+                service_endpoint_type = getattr(cfg, 'endpoint_type', None)
         if not service_region:
             service_region = CONF.identity.region
-        return service_region
+        return service_region, service_endpoint_type
 
     def _error_checker(self, method, url,
                        headers, body, resp, resp_body):
diff --git a/tempest/common/service_client.py b/tempest/common/service_client.py
index ad6610a..87e925d 100644
--- a/tempest/common/service_client.py
+++ b/tempest/common/service_client.py
@@ -14,10 +14,6 @@
 
 from tempest_lib.common import rest_client
 
-from tempest import config
-
-CONF = config.CONF
-
 
 class ServiceClient(rest_client.RestClient):
 
@@ -26,15 +22,11 @@
                  disable_ssl_certificate_validation=None, ca_certs=None,
                  trace_requests=None):
 
-        # TODO(oomichi): This params setting should be removed after all
-        # service clients pass these values, and we can make ServiceClient
-        # free from CONF values.
-        dscv = (disable_ssl_certificate_validation or
-                CONF.identity.disable_ssl_certificate_validation)
+        dscv = disable_ssl_certificate_validation
         params = {
             'disable_ssl_certificate_validation': dscv,
-            'ca_certs': ca_certs or CONF.identity.ca_certificates_file,
-            'trace_requests': trace_requests or CONF.debug.trace_requests
+            'ca_certs': ca_certs,
+            'trace_requests': trace_requests
         }
 
         if endpoint_type is not None: