how to stop a connection to a specific UDP/TCP port?

aromes · 03-04-2004, 04:43 PM

how to stop a connection to a specific UDP/TCP port?
for ie, I've just seen a connection at port 3765 and want to shut it down
on the fly!

chrisfirestar · 03-04-2004, 07:28 PM

if the connection is made to a service then kill the service i guess...
generally a connection can (i could be wrong) only be made to a port that has a service listening.. otherwise the port will appear closed (if you not using iptables to DROP the ports)

I would suggest that if you dont already have a firewall setup DO IT! iptables is very good just learn how to use it

qwijibow · 03-04-2004, 07:37 PM

block it in your firewall.

/sbin/iptables -I INPUT -p tcp --dport 3765 -j DROP
/sbin/iptables -I INPUT -p udp --dport 3765 -j DROP

or you can do it graphically with firestarter