How to prevent the attacks from Hacking tools such as Wpe pro?

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Job Description

now i need to tell you my problem : we are have chat website called using 123flashchat chat java script
for example :

some bad people using some tools or programs and some filters to break our protection and making flood inside our chat looby,
another example : we are making firewall before login the chat control panel and this bad programs like Wpe pro can baypass this protections using some filters to access our panel without firewall.
we are need any solution for that - to prvent our server visitors from using this tools and access to chat application normaly