Re: All Ports filtered, no OS identify

[mgrd <subscriptions () gerdau freeshell org>]

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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