Is there any way to on/off windows firewall using Java? I search on google and stack-overflow, i don't find anything useful.
Yes.
There is a COM interface that allows the firewall state to be controlled. Here's an example from MSDN in C++.
Note that your Java program needs elevated permissions to change the setting.
For tips on using COM from Java, see
Is it possible to call a COM API from Java?
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