ping doesn't work

Blog pinging from within COREBlog isn't working for me.

From the command line, it works:

>>> import xmlrpclib
>>> s = xmlrpclib.Server('http://coreblog.org/ping/')
>>> print s.weblogUpdates.ping('(render-blog Ng Pheng Siong)', 
          'http://sandbox.rulemaker.net/ngps')
{'message': 'Thanks :-).'}
>>>

But not from within Zope 2.6.4. ;-\