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A proxy server is a server that acts as an intermediary for requests from clients seeking resources from other servers. A proxy server is also used to hide the client's ip address from the server.

Simple Way to find a Proxy Server.

The nmap tool (available at nmap.org) which is used for scanning ports on a network or a single computer can be used to find open ports on a given network.

Proxy servers generally run on port 8080, so if the output of nmap shows port 8080 as open on a particular computer, it must be running a proxy server on that port with high probability.

Online businesses frequently need to know whether the client machine is an open proxy or not for security reasons (For eg:- To prevent credit card fraud)

To identify whether a particular proxy is an open proxy, proxycheck can be used - This tool checks for open proxies ( Elite/Highly anonymous proxies). proxychecker (available at www.corpit.ru/mjt/proxycheck.html )

The proxy status of the client's IP Can be identified by running the following right after the order is placed

  1. Run a port scan with nmap against the client IP Addreess,
  2. Now run proxycheck against the ports nmap gives in the above step.

For legal reasons, the customer's permission may be required to to run the above steps against the client IP Address

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