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problems with the free portscan by nksecurity

   Hi all,

I have the astaro linux-firewall 2.0 and
I did a free firewall-test on the Homepage www.nksecurity.de. There several things could be done like checking traceroute, portscan, zonetransfer, etc.

The result of the portscan is:
...
    20/tcp filtered ftp-data
    21/tcp filtered ftp
    23/tcp filtered telnet
    53/tcp filtered domain
    137/tcp filtered netbios-ns
    138/tcp filtered netbios-dgm
...

My question is:
Is it dangerous that the software has detected my ports, especially the netbios-protocoll.
What result would be dangerous and how could I fix it.

Thank you all for any support and help.

Bye Mike

This thread was automatically locked due to age.

0 roeschu over 22 years ago

hi

afaik filtered means in this test that the port is "stealth" (closed, no service available on this port..) so your result is ok. Every port which has been tested is not reachable for the world. If a port would be "open" instead of filtered it would mean that a service would run on this port

ex.

   21/tcp open ftp
    23/tcp filtered telnet
    25/tcp filtered smtp
    53/tcp filtered domain
    80/tcp open http
    137/tcp filtered netbios-ns
    138/tcp filtered netbios-dgm
    443/tcp filtered https

means that a webserver and a ftp server runs behind this firewall

greets

p.s in fact "filtered" means that the portscan wasn't able to contact the specific port .
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