(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)
Make sure your firewall allows TcpCatcher to behave as a proxy server.
If you chose HTTP Mode, set up your browser to use TcpCatcher as a web proxy
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