diff --git a/keystonemiddleware/_common/config.py b/keystonemiddleware/_common/config.py
index 3e38eba1..de701b09 100644
--- a/keystonemiddleware/_common/config.py
+++ b/keystonemiddleware/_common/config.py
@@ -49,17 +49,18 @@ def _conf_values_type_convert(group_name, all_options, conf):
     for k, v in conf.items():
         dest = k
         try:
-            if v is not None:
+            # 'here' and '__file__' come from paste.deploy
+            # 'configkey' is added by panko and gnocchi
+            if v is not None and k not in ['here', '__file__', 'configkey']:
                 type_, dest = opt_types[k]
                 v = type_(v)
         except KeyError:  # nosec
-            # This option is not known to auth_token. v is not converted.
             _LOG.warning(
-                'The option "%s" in conf is not known to auth_token', k)
+                'The option "%s" is not known to keystonemiddleware', k)
         except ValueError as e:
             raise exceptions.ConfigurationError(
-                _('Unable to convert the value of %(key)s option into correct '
-                  'type: %(ex)s') % {'key': k, 'ex': e})
+                _('Unable to convert the value of option "%(key)s" into '
+                  'correct type: %(ex)s') % {'key': k, 'ex': e})
         opts[dest] = v
 
     return opts
diff --git a/keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py b/keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py
index 5c59d145..130eae7a 100644
--- a/keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py
+++ b/keystonemiddleware/tests/unit/auth_token/test_auth_token_middleware.py
@@ -513,7 +513,7 @@ class GeneralAuthTokenMiddlewareTest(BaseAuthTokenMiddlewareTest,
         conf = {
             'wrong_key': '123'
         }
-        log = 'The option "wrong_key" in conf is not known to auth_token'
+        log = 'The option "wrong_key" is not known to keystonemiddleware'
         auth_token.AuthProtocol(self.fake_app, conf)
         self.assertThat(self.logger.output, matchers.Contains(log))