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Ipchains Questions

Hello Im running Potato for a firewall with ipchains. I would like to
increase my security and currently have all ports stealth except 25 smtp, 79
Finger, 80 http. If I make these ports stealth will this affect the ability
to use the web and mail? I also tried to make netbois stealth but if still
shows as closed. I used :
/sbin/ipchains -A input -s -d $MY_IP 139 -p tcp -j REJECT

Why is this now working??

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