I was needing to use ZSyncher via a proxy server in our firewall. I wrote a new transport to do this that you might want to incorporate into ZSyncher. Nice product btw. Very helpful for my setup. Any chance of getting it to synch bidirectionally? import urllib class AuthProxyTransport(xmlrpclib.Transport): '''Handles an HTTP transaction to an XML-RPC server via a http proxy and using basic authentication djay@slarken.org.au ''' def __init__(self, username=None, password=None): self.username = username self.password = password self.verbose = None self.has_ssl = 0 self.proxies = urllib.getproxies() def request(self, host, handler, request_body, verbose=0): # issue XML-RPC request import httplib # Override to use proxies realhost = None if self.proxies.has_key("http"): realhost = host proxy = self.proxies["http"] urltype, proxyhost = urllib.splittype(proxy) host, selector = urllib.splithost(proxyhost) h = httplib.HTTP(host) if realhost: h.putrequest("POST", "http://" + realhost + handler) else: h.putrequest("POST", handler) # required by HTTP/1.1 if realhost: h.putheader("Host", realhost) else: h.putheader("Host", host) # required by XML-RPC h.putheader("User-Agent", self.user_agent) h.putheader("Content-Type", "text/xml") h.putheader("Content-Length", str(len(request_body))) #Override to do authentication (should really use username and password encoded in url like urllib) if self.username is not None and self.password is not None: h.putheader("AUTHORIZATION", "Basic %s" % string.replace( encodestring("%s:%s" % (self.username, self.password)), "\012", "")) h.endheaders() if request_body: h.send(request_body) errcode, errmsg, headers = h.getreply() if errcode != 200: raise xmlrpclib.ProtocolError( host + handler, errcode, errmsg, headers ) return self.parse_response(h.getfile())