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IPTABLES & Ports



I have set-up the firewall on a DNS server to HIGH & only open the UDP port,
but when I ask www.hackerwatch.org/probe to probe the system it states that
the following ports are open ! 21,23,25,80,110,139,143,443
Is this correct and to be expected ?
How do I close the unwanted ports ?
how do I make the system more secure (as secure as is reasonable for a DNS
server)

Many thanks

Denis Croombs





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