diff -r a22ef88143b9 Lib/test/test_urllib2_localnet.py
--- a/Lib/test/test_urllib2_localnet.py	Sat Oct 25 23:05:21 2014 -0500
+++ b/Lib/test/test_urllib2_localnet.py	Tue Oct 28 14:09:32 2014 +0000
@@ -1,6 +1,7 @@
 import base64
 import os
 import email
+import socket
 import urllib.parse
 import urllib.request
 import http.server
@@ -21,7 +22,7 @@
 CERT_localhost = os.path.join(here, 'keycert.pem')
 # Self-signed cert file for 'fakehostname'
 CERT_fakehostname = os.path.join(here, 'keycert2.pem')
-
+localhost_ip = socket.gethostbyname('localhost')
 
 # Loopback http server infrastructure
 
@@ -59,7 +60,7 @@
         self._stop_server = False
         self.ready = threading.Event()
         request_handler.protocol_version = "HTTP/1.0"
-        self.httpd = LoopbackHttpServer(("127.0.0.1", 0),
+        self.httpd = LoopbackHttpServer((localhost_ip, 0),
                                         request_handler)
         self.port = self.httpd.server_port
 
@@ -289,7 +290,7 @@
         def http_server_with_basic_auth_handler(*args, **kwargs):
             return BasicAuthHandler(*args, **kwargs)
         self.server = LoopbackHttpServerThread(http_server_with_basic_auth_handler)
-        self.server_url = 'http://127.0.0.1:%s' % self.server.port
+        self.server_url = 'http://%s:%s' % (localhost_ip, self.server.port)
         self.server.start()
         self.server.ready.wait()
 
@@ -315,7 +316,7 @@
 
 @unittest.skipUnless(threading, "Threading required for this test.")
 class ProxyAuthTests(unittest.TestCase):
-    URL = "http://localhost"
+    URL = "http://%s" % localhost_ip
 
     USER = "tester"
     PASSWD = "test123"
@@ -333,7 +334,7 @@
         self.server = LoopbackHttpServerThread(create_fake_proxy_handler)
         self.server.start()
         self.server.ready.wait()
-        proxy_url = "http://127.0.0.1:%d" % self.server.port
+        proxy_url = "http://%s:%d" % (localhost_ip, self.server.port)
         handler = urllib.request.ProxyHandler({"http" : proxy_url})
         self.proxy_digest_handler = urllib.request.ProxyDigestAuthHandler()
         self.opener = urllib.request.build_opener(