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Originally Posted by BBKing
No you aren't, as explained earlier. The sooner people grasp that they aren't 'on' a particular proxy the better. You're on Hersham proxies. Thanks for the report though.
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Yes it's the port 80 traffic redirectors (e.g. Cisco WCCP routers or Layer 4 switches) which dynamically assign which cache that you're going through for any particular request.
They can redirect the request based on various things such as cache load, requested URL or source ip. The requested URL is a useful consideration so that content doesn't get duplicated across caches.
So that's why if you are having problems then ntl will prolly require at least your ip and destination URL (and region) if they are to know which cache you are likely to be going through.
Of course if you manually specify a proxy then it is fixed and you bypass all that mechanism.