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Re: High udp port are open temporarily



On Mi, 14 iul 10, 21:47:57, pch0317 wrote:
> Hi :)
> 
> I install new server with Debian stable (base system only with ssh
> and bind).
> I scan port with:
> nmap -sS -sU -T4 -A -v -PE newserver
> and get that few port with number 40000 and higher are open|filtered.
> When I scan newserver again I get other few udp port open (differnt
> number of port).
> 
> When I use lsof -i or netstat in this newserver I get only named and
> sshd work in 22 and 53 TCP and UDP port and exim work on localhost
> 25 port. No high open udp port are discovered.
> 
> Why nmap show this temporarily open high port.
> What can I do?

Are you scanning from the same computer? Try scanning from a remote 
host.

Regards,
Andrei
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