pix port scanning

hello all,

can anyone tell me what is the best way (site, software) to scan my pix

firewall opened port.

note that my network is very big network and we have many pix firewalls

in differnt locations. i tried to make a port scanning though some web sites and the resultes was positive. but the security auditor said that

i have many open ports! so how can i make a real deep scanning and what

range of ports i have to apply?

thanx in advance

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asj
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