port used by a chatserver -> how to make it stealth?

hello,

I'm running on my rh 7.2. box a chat server which opens a port. There is no security related problem with that, but for other reasons (prevent to access chat with certain programs) I'd like to have this port running in stealth mode.

Is something like this possible (mostly because its the port used by a chat)?

f.eg. If I do a portscan I see that this port connects... is there a way to block this but without having problems with the chat itself?

thanks a lot,
chris

 

 

 

 

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