Re: nmap showing all non-listening port 80 as "filtered"

[vladz <vladz () devzero fr>]

Hi,

On Fri, Jan 15, 2010 at 08:45:06AM -0500, nexact wrote:
> I'm trying to figure why nmap is reporting all port 80 that is not closed or
> opened as "filtered".

The "filtered" state does not mean that port is opened. It means that nmap 
did not receive any SYN/ACK or RST packet from port 80.

> I know that port 80 is listening for .171, however I'm 100% sure that
> there's no firewall nor open port for .185 .. but it's still displaying it
> as "filtered"

Which OS is running on .185 ? If port 80 is closed and not filtered, host 
should reply with RST packet. Maybe you could verify this with tcpdump or 
hping ?

vladz.
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