nmap output "open | filtered"

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I'm scanning a windows server in my network and getting this output

nmap -sU :

 42/udp  open|filtered nameserver
 123/udp open|filtered ntp
 135/udp open|filtered msrpc
 137/udp open|filtered netbios-ns
 138/udp open|filtered netbios-dgm

how can ports be open and filtered at the same time? or how should I
interpret this information?



Re: nmap output "open | filtered"

phipo wrote:
Quoted text here. Click to load it

'|' should be interpreted as 'or'. The ports are either open or
filtered, and there is no easy way to distinguish the two.

A closed port would return an icmp-port-unreacheable, but if no answer
is received (like in your case) the port is either open (application
accepting the packets) or a portfilter is silently dropping the packets
(aka filtering).


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