Nmap Development: Re: All Ports filtered, no OS identify

[dednj cjcb ekdj <netwiator () yahoo com>]

O.k.
 
Thx for the answers.
 
But it is strange that Symantec PFW gives you so much security that you even can´t break in from outside... (if you 
even know which pfw it is) 

mgrd <subscriptions () gerdau freeshell org> wrote:
dednj cjcb ekdj wrote:
> When I try nmap -sS -P0 192.168.1.100 , I get the response all ports are filtered.
>
> The same result with -sW , or with -O 
>
> I ´ve installed on 192.168.1.100 a PFW. 
>
> But how can I get any information (OS, Service Pack) out, if even do not get any answer from the machine? Is there 
> any trick or do I have forgotten something?
nmap needs at least both one open and closed port for OS detection.

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