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I'm currently browsing through a local transparent proxy.

I'm receiving 404 responses from a couple of web hosts, although the proxy works perfectly with everything else; I was wondering whether it could be the websites recognizing and blocking the proxy user.

Is this a possibility or is there something wrong with the proxy?

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    Big subject, see: sans.org/reading-room/whitepapers/detection/… – Simon Hayter Jul 5 '14 at 14:12
  • It is possible to block known proxies using a black-list at various levels including some web-servers. However, open proxies come and go by the minute. There are servers that test for various proxies as part of unnamed hush-hush security apparatus(s) and that data does get into the black-lists relatively quickly. – closetnoc Jul 5 '14 at 14:56
  • Unfortunately, this question doesn't appear to be about a website under your control, and is also fairly broad. – dan Jul 10 '14 at 5:04

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