> small operations. I'm pretty convinced that the problem is on their > end. My theory is that these proxies may have cached the cookie > with an IP address which they provide their clients.
Have you tried capturing all ethernet packets and seeing if the raw data supports this conclusion. Checkout: http://www.ethereal.com/ We have found that it is the bigger ISPs which have faulty caches. Usually it is a DNS problem, not an HTTP caching problem. Another trick is throwing a time stamp in every cookie. This is useful for other reasons, e.g. cookie expiration and validation. Cheers, Rob
