diff --git a/keystone/auth/controllers.py b/keystone/auth/controllers.py
index ffe7f20675..034a06dfd3 100644
--- a/keystone/auth/controllers.py
+++ b/keystone/auth/controllers.py
@@ -189,7 +189,7 @@ class AuthInfo(object):
             else:
                 domain_ref = self.resource_api.get_domain(domain_id)
         except exception.DomainNotFound as e:
-            LOG.exception(six.text_type(e))
+            LOG.warning(six.text_type(e))
             raise exception.Unauthorized(e)
         self._assert_domain_is_enabled(domain_ref)
         return domain_ref
@@ -453,7 +453,7 @@ class Auth(controller.V3Controller):
         try:
             user_ref = self.identity_api.get_user(auth_context['user_id'])
         except exception.UserNotFound as e:
-            LOG.exception(six.text_type(e))
+            LOG.warning(six.text_type(e))
             raise exception.Unauthorized(e)
 
         default_project_id = user_ref.get('default_project_id')
diff --git a/keystone/auth/plugins/core.py b/keystone/auth/plugins/core.py
index 64ad58890a..c28b74cd22 100644
--- a/keystone/auth/plugins/core.py
+++ b/keystone/auth/plugins/core.py
@@ -147,7 +147,7 @@ class BaseUserInfo(object):
             else:
                 domain_ref = self.resource_api.get_domain(domain_id)
         except exception.DomainNotFound as e:
-            LOG.exception(six.text_type(e))
+            LOG.warning(six.text_type(e))
             raise exception.Unauthorized(e)
         self._assert_domain_is_enabled(domain_ref)
         return domain_ref
@@ -177,7 +177,7 @@ class BaseUserInfo(object):
                     user_ref['domain_id'])
                 self._assert_domain_is_enabled(domain_ref)
         except exception.UserNotFound as e:
-            LOG.exception(six.text_type(e))
+            LOG.warning(six.text_type(e))
             raise exception.Unauthorized(e)
         self._assert_user_is_enabled(user_ref)
         self.user_ref = user_ref