find and kill process which running on port

Question

I'm trying to kill the process associated with port 161 (SNMP) on OS X.

I tried to get the process ID associated with this port using netstat and lsof but none of these seem to list PIDs:

$ netstat -an | grep 161
udp4       0      0  *.161                  *.*

$ netstat -anp udp | grep 161
udp4       0      0  *.161                  *.*   

lsof -i :161

I'm on ubuntu and if I run the command "sudo netstat -anp" instead of just "netstat -anp" I am getting process id. — msound, Apr 23 '14 at 03:51
try `netstat -anp|grep :161[[:blank:]]` . or `lsof -w -n -i tcp:161` or `fuser -n tcp 161` — Jayesh Bhoi, Apr 23 '14 at 03:51
possible duplicate of [Who is listening on a given TCP port on Mac OS X?](http://stackoverflow.com/questions/4421633/who-is-listening-on-a-given-tcp-port-on-mac-os-x) — Adrian Frühwirth, Apr 23 '14 at 06:44

score 0 · Answer 1 · answered Apr 23 '14 at 06:56

0

SNMP is UDP, not TCP. It does't "listen" because there is no such concept for UDP sockets.

Look for the process by its name or process ID instead.

answered Apr 23 '14 at 06:56

tripleee

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Technically this is not correct, [there is SNMP over TCP](https://tools.ietf.org/html/rfc3430) but it's not commonly implemented. `snmpd` does seem to implement TCP (see `man snmpd`) and its man page even states *"By default, snmpd listens for incoming SNMP requests on UDP port 161 on all IPv4 interfaces."* however unlucky that wording might be. "listen" != `listen()`. The information OP is after *can* be retrieved using `netstat -anup | grep :161`, just not on OS X. – Adrian Frühwirth Apr 23 '14 at 12:44

find and kill process which running on port

1 Answers1