diff --git a/TESTING b/TESTING
index 2b433d7eb2..7c16f374f8 100644
--- a/TESTING
+++ b/TESTING
@@ -27,6 +27,15 @@ Running tests
     After running all of the tests, run_test.sh will report any pep8 errors
     found in the tree.
 
+Running individual tests
+
+    Individual tests can be run using run_tests.py, you just need to pass
+    the dot-separated path to the module you want as an argument to it.
+    For example, the following would run only the APITestV11 tests from
+    quantum/tests/unit/test_api.py:
+
+      $ ./run_tests.sh quantum.tests.unit.test_api:APITestV11
+
 Adding more tests
 
     Quantum is a pretty new code base at this point and there is plenty of
diff --git a/quantum/api/faults.py b/quantum/api/faults.py
index 3ad04e5f41..a9e373fcb7 100644
--- a/quantum/api/faults.py
+++ b/quantum/api/faults.py
@@ -55,7 +55,7 @@ def fault_body_function_v10(wrapped_exc):
 
 def fault_body_function_v11(wrapped_exc):
     """ This function creates the contents of the body for a fault
-    response for Quantum API v1.0.
+    response for Quantum API v1.1.
 
     :param wrapped_exc: Exception thrown by the Quantum service
     :type wrapped_exc: quantum.common.exceptions.QuantumException
diff --git a/quantum/tests/unit/_test_api.py b/quantum/tests/unit/_test_api.py
index 0ef5fa3da3..5d27fb8662 100644
--- a/quantum/tests/unit/_test_api.py
+++ b/quantum/tests/unit/_test_api.py
@@ -18,8 +18,12 @@
 #    @author: Salvatore Orlando, Citrix Systems
 
 import logging
-import unittest
+import unittest2 as unittest
 
+import mock
+
+from quantum.api.api_common import APIFaultWrapper
+from quantum.api.networks import Controller
 from quantum.common.test_lib import test_config
 from quantum.common import utils
 from quantum.db import api as db
@@ -1187,3 +1191,21 @@ class BaseAPIOperationsTest(AbstractAPITest):
 
     def test_multitenancy_json(self):
         self._test_multitenancy('json')
+
+    def test_internal_error(self):
+        """Check that internal errors do not leak.
+
+        Any internal, unexpected error should be turned into a 500 response
+        without any traces of the original exception.
+        """
+        orig_exception_msg = "An exception with a traceback"
+
+        @APIFaultWrapper()
+        def raise_exception(self, *args, **kwargs):
+            raise Exception(orig_exception_msg)
+
+        list_network_req = testlib.network_list_request(self.tenant_id, "json")
+        with mock.patch.object(Controller, 'index', new=raise_exception):
+            list_network_res = list_network_req.get_response(self.api)
+        self.assertEqual(list_network_res.status_int, 500)
+        self.assertNotIn(orig_exception_msg, list_network_res.body)
diff --git a/quantum/wsgi.py b/quantum/wsgi.py
index 4028250048..6dd5086140 100644
--- a/quantum/wsgi.py
+++ b/quantum/wsgi.py
@@ -752,6 +752,12 @@ class Resource(Application):
             action_result = Fault(ex,
                                   self._xmlns,
                                   self._fault_body_function)
+        except Exception:
+            LOG.exception("Internal error")
+            # Do not include the traceback to avoid returning it to clients.
+            action_result = Fault(webob.exc.HTTPServerError(),
+                                  self._xmlns,
+                                  self._fault_body_function)
 
         if isinstance(action_result, dict) or action_result is None:
             response = self.serializer.serialize(action_result,
diff --git a/run_tests.py b/run_tests.py
old mode 100644
new mode 100755
diff --git a/tools/pip-requires b/tools/pip-requires
index 43be661c2e..cbb9f18316 100644
--- a/tools/pip-requires
+++ b/tools/pip-requires
@@ -3,7 +3,6 @@ PasteDeploy==1.5.0
 Routes>=1.12.3
 eventlet>=0.9.12
 lxml
-mox==0.5.3
 python-gflags==1.3
 sqlalchemy
 webob==1.0.8
diff --git a/tools/test-requires b/tools/test-requires
index e0f0058b3f..8426f998d5 100644
--- a/tools/test-requires
+++ b/tools/test-requires
@@ -2,9 +2,11 @@ distribute>=0.6.24
 
 coverage
 mock>=0.7.1
+mox==0.5.3
 nose
 nosexcover
 openstack.nose_plugin
 pep8==0.6.1
 sphinx>=1.1.2
+unittest2
 webtest