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We had an incorrect url on our website set up to 301 redirect. We updated the redirects. All our internal machines now see the urls correctly. New machines are all seeing the url correctly. One of our clients is still reporting seeing the old link. We have instructed them to clear their cache. They are still seeing the old link.
They are going as far as to claim that new browsers installed on the machine (safari) is still seeing the old link.

Can the 301 redirect be cached anywhere machine wide that clearing the browser cache is not getting? Is there anything special IE needs to clear the 301 cache (outside normal cache clearing)?

I also know this is out of scope, but could it be cached at the corporate network level?

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Cached at the corporate level is completely possible if they use a "poorly" configured proxy server which all of their employees must run through. I say "poorly" only because if their server is not updating the page information frequently enough then there could be this problem where it will continue to direct its employees to the old link. I am not sure about locally on their computers though...I image if you clear the cache on the web browser it should solve the problem. If they specially developed a caching algorithm locally that could change the scenario but I doubt thats the case – Stephen R Jul 5 '12 at 20:01
The problem turned out to be a freak coincidence – Andrey Jul 6 '12 at 15:50

closed as too localized by random♦ Jul 6 '12 at 16:03

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, see the FAQ.

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Tell them to do a hard refresh by holding Shift (or Option if on mac) while clicking the refresh button (safari only). However, if they really did clear their cache like you instructed then this won't help, but if they didn't this will allow them to not have to remove all of their cache.

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