What's the application of UDP port 59311?

core2

New Member
Hello

I'm seeing an active UDP connection to port 59311 , can any friend here help me what's the purpose of this connection?

This port can't be closed using iptables or any other method.

I have a Linux/Virtuozzo + Plesk VPS with Knownhost , KH is great :)
 

KH-Paul

CTO
Staff member
core2,

You can see the process that is responsible for the connection on this port using the following command:

Code:
netstat -anp | grep 59311
 

core2

New Member
Using # netstat -anp --udp I see there are some connections relating port 53 , in addition there is the above mentioned connection , the process is "named" too , should name server use UDP port 59311? Is it a normal connection in Virtuozzo?

I see this report :

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
udp 0 0 0.0.0.0:59311 0.0.0.0:* 24146/named
udp 0 0 67.x.x.x:53 0.0.0.0:* 24146/named
udp 0 0 67.x.x.x:53 0.0.0.0:* 24146/named
udp 0 0 127.0.0.1:53 0.0.0.0:* 24146/named


Could not find any info on the web and this is the first time I see this port number.
 

KH-Paul

CTO
Staff member
core2,

This is normal and nothing to be afraid of. This output shows that named is listening on port 53 as it should plus it is listening on one more port where it expects some data to be received from remote nameserver. You're basically seeing nameserver port randomization feature in action
 
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