sometimes, a scan shows filtered..

["Roeland Th. Jansen" <nmap () grobbebol xs4all nl>]

today a friend of mine and I were experimenting against his windows
machine and consecutive scans show consistently all the specified scan
ports closed.

but sometimes, I see a weird thing. instead of reporting the ports to be
closed, it reports :

1214/tcp   filtered    kazaa
1503/tcp   filtered    imtc-mcs
1720/tcp   filtered    h323hostcall
1863/tcp   filtered    msnp

which happen to be the four ports we were experimenting with. since
it;'s closed, no problem but it struck me that it was filtered.

why ?


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