Originally posted here by gore
iptables -A INPUT -i eth0 -s 0/0 -d MyPrivateIPForSlackwarebox -p tcp \ --dport telnet -j DROP
Tried this?

iptables -A INPUT -i eth0 -s 0/0 -d MyPrivateIPForSlackwarebox -p tcp --dport 22 -j DROP

Steve

Oh, and -p is protocol