I'm using xmlrpclib from a standalone Python script to post articles to Squishdot. It seems that calls to methods that return strings work fine, while calls to other methods fail with tracebacks like the following: Traceback (innermost last): File "./postToControlCom.py", line 77, in ? postMessage(msg) File "./postToControlCom.py", line 68, in postMessage summary, subject, "Automation List") File "./xmlrpclib.py", line 547, in __call__ return self.__send(self.__name, args) File "./xmlrpclib.py", line 630, in __request request File "./xmlrpclib.py", line 582, in request headers xmlrpclib.ProtocolError: <ProtocolError for silver.control.com/zope/: 500 Internal Server Error> This sort of thing seems to happen no matter what the non-string return type is. In the case above, the difference between the following code (which works) and the failing code is exactly the rather bogus last line: "return 'Done'". The code is in zope as an External Method (since I can't use xmlrpc to do the same thing from my script). def postSquishdotReply(self, title, author, body, email='', notify='', file='', summary='', subject='', dept='', REQUEST=None, RESPONSE=None): results = self.__call__({'title':title, 'subject':subject, 'op':'articles'}) if len(results): # If there are multiple Articles with the same title and subject, # just use the first one. article = results[0] article.addPosting(title, author, body, email, notify, file, REQUEST, RESPONSE) else: self.addPosting(title, author, body, email, notify, file, summary, subject, dept, REQUEST, RESPONSE) # It appears that calls via xmlrpclib throw: # xmlrpclib.ProtocolError: # <ProtocolError for silver.control.com/zope/: 500 Internal Server Error> # if a method called by it doesn't return a string. # This is bogus, but: return 'Done' BTW: all of this appears to me to be true whether or not Squishdot is involved -- I have tested with target methods that are not part of it. What am I doing wrong here? Dan Pierson, Control Technology Corporation, <dan@control.com>