NMAP Issue with Ping

[Louay Saleh <lsaleh77 () yahoo com>]

Dear All,
 
I have a strange issue when using Nmap. I have a personal firewall. When it is enabled, I always get that the target of 
the scanning as down (although I am sure that the target is up since I did normal ping from my CMD and it was 
replying!) and I have to use the -PN switch. I thought my firewall was blocking the received packets of the TCP ping, 
but when I tried to do a Ping scan (using the -sP swicth, in order to do ICMP ping), I got the same issue. If I disable 
my firewall, everything is OK. I revised my firewall rules, but I could not find anything blocking the reply from 
either the TCP ping and the Ping scans of Nmap. It is very strange....this means that the firewall blocks only the ping 
replies (whether TCP or ICMP) related to Nmap, and allows the normal ping. This is the only conclusion I reached, but 
why is that?
 
I appreciate your help in advance.
 
Best Regards,



_____________________________________________________
He who learns but does not think, is lost! 
He who thinks but does not learn is in great danger.

Confucius
(551-479 BC) 
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