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How to block visitors using Proxy Servers

Last Modified: 2015-11-12

I want to block visitors using proxy server to connect my website. We have already blocked some countries where we dont serve indeed to stop hackers & malicious programs. But still we are getting some suspicious visitors using proxy servers.

How do i block these proxy servers?
Blocking proxy server will have any effect on search engine crawling

My Server : Windows 8
Web Server : IIS 7.0
Website : PHP

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