Firewall port scanner

Any suggestions on the best free or low cost Windows based port scanner?
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Will SzymkowskiSenior Solution ArchitectCommented:

Try this port scanner out. Its also free =D

Hope this helps

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nmap - (also has a GUI but I just use command line)

Check out this site: (A lot of scanners listed) (SuperScan 4.0)


No body knows windows better than microsoft...This is what i use and works really well
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nmap is a classic and Superscan are classics. I won't knock on the Microsoft product, but we also know how good they are with security. :-P

You can search on Google for 'port scanning tools' and should have a nice long list. Even some websites that will scan ports (not that I really trust this one).
Rich RumbleSecurity SamuraiCommented:
Superscan and Nmap, also the free trial version of GFI Languard Network Security Scanner is far and away a great tool.
Ethereal.  The best, and free

Rich RumbleSecurity SamuraiCommented: does not scan ports... it decodes packets that are sniffed
I would recommend Blue's Port Scanner .Nmap is really slow and others come with installers.
Superscan is also good.
Blue's Port Scanner is excellent because it is a single executable ,scans are lightining fast provides usefull functions.
Me and my friends have used this in our collage lab to find the ports which out teachers had blocked,So it works fine.
Sorry here is the link to Blue's Port Scanner
jjparrottAuthor Commented:
I appreciate all the feedback.  All the scanners listed were really good tools.  I found the Advanced Port Scanner more helpful when auditing the firewall, but the SuperScan has far more options.  

I really liked the Advanced Administration scanner from if anyone wants to check it out.
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