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When I download something, any browser (Internet Explorer, Firefox) will show following message:

Refresh (dynamic_bypass_reload)
Click here if you are not automatically redirected.
For assistance, contact your network support team. 

What does that mean?

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all major browsers, IE, FIREFOX, etc –  Mista Aug 21 '11 at 10:31
    
Any particular site, or every site? Are you on a corporate network or a home internet service provider? –  Mokubai Aug 21 '11 at 10:34
    
It would be great to have a screenshot and a bit more information, i.e. does it only happen on your computer or any computer in your network? Is it a popup window or is it displayed within the website? What ISP are you on? –  slhck Aug 21 '11 at 10:34
    
File hosting sites, like rapidshare, megaupload, and others –  Mista Aug 21 '11 at 10:35

1 Answer 1

I researched a bit. Turns out, your ISP has a cache proxy which serves content to you. Now, ISPs aren't stupid. They know that when they use a cache proxy to serve content to you, they are hiding your IP address to the site they are serving.

So, when you browse any website, you request it from your ISP, the ISP fetches it for you, and returns it to you. By caching it, they can serve you the website faster.

I created a graphic which should show you a simplified version of that principle.

But, when you browse a legal grey-area website like Rapidshare or Megaupload, they don't want you to fetch content over their cache. This is why they directly connect you to it:

This is so that your IP is directly exposed to those websites, since the ISP doesn't want to be involved. So basically, this message only informs you that you're now being redirected.

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I mean, it would make sense just to call your ISP and innocently ask what they're doing. –  slhck Aug 21 '11 at 10:45
    
+1 for the pretty diagrams! –  8088 Aug 21 '11 at 13:53

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