[Zope] Problem with Cookieless Sessions on Mozilla and Netscape

I can't get cookie-less session in Mozilla. They work fine in IE. This is the python script I am using to run the test: ## Script (Python) "testSession" ##bind container=container ##bind context=context ##bind namespace= ##bind subpath=traverse_subpath ##parameters= ##title= ## session = context.REQUEST.SESSION if session.has_key('mb'): return 'second time' else: session['mb'] = 1 return 'first time' I am running the 2.5.1 binary on Windows XP. Both Mozilla (Build ID: 2002053012) and Netscape 4.51 show 'first time', no matter how many times I refresh. Any ideas? Thanks. Mark