How to block a port, such as 21?
 

Hi threre,

I wan to write a program that can block a port, such as 21.

But I don't konw how to do it.

Thanks a lot:)

Silly question, but why not just stop the services,
or use iptables?


Cheers,
Tink

Thanks, Tinkster.

What I mean is that: after I block the specified ports, all subsequent processes can not use these ports, but I don't want to kill these process.

BTW, how to write a program with Iptables? thanks again.

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