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  • Once you have downloaded TcpCatcher jar file, just open it with java (on windows, you would right click on it and choose Open with java).
    (If you are planning to capture a lot of traffic, you might launch it from a command line in order to allow the java process allocate some more memory if necessary :
    java -jar TcpCatcher.jar -Xmx512m
    and increase 'Max History table size' parameter in TcpCatcher Settings panel)

  • Choose port TcpCatcher will be listening on (default port 8200 should be fine).
    Make sure your firewall allows TcpCatcher to behave as a proxy server.

  • Choose if you want to monitor an HTTP conversation (HTTP Proxy) or any other TCP based conversation between your client and a specific host (TCP Proxy).

  • If you chose Tcp Proxy, set up your client application to target TcpCatcher instead of the host server and set up TcpCatcher to target the host server (field Server Host and Server Port).
    If you chose HTTP Mode, set up your browser to use TcpCatcher as a web proxy

  • Press "Apply Settings and Start" and start monitoring traffic

  • Turn on Catch Mode or plug your own hook if you intend to modify packets on the fly

  • Visit tutorials section

  • TcpCatcher QuickStart Video (choose 720p HD and toggle full screen)