On Thu, Oct 17, 2002 at 10:32:31PM -0500, Mark Roach wrote: > On Fri, Oct 18, 2002 at 12:50:05PM +1000, Joyce, Matthew wrote: > > Port State Protocol Service > > 143 filtered tcp imap2 > > > > Nmap run completed -- 1 IP address (1 host up) scanned in 1 second > > > > What does 'filtered' mean ? > > Is the TCP wrapper doing this ? > > Do I have to specifically allow access from other networks ? > > Basically, filtered means that a firewall is denying access to that > port. This may be tcpwrappers or iptables/chains or a firewall in > between your systems. How does nmap detect that? I would assume that if the firewall responds with a TCP RESET, that nmap will mark the port as closed. If the firewall just silently drops the packet, then how does nmap know the host is up? -rob
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