It is always a requirement for administrators or troubleshooters to find out which process is holding the port. I have listed out few commands below to find out the same. commands differ for different Operating Systems.
SOLARIS
Note:- Execute below command in single line. Otherwise use it as a script. Replace the red marked port# with your port#.# for i in `ls /proc`;do pfiles $i | grep AF_INET | grep 9262;if [ $? -eq 0 ];then echo "=> PORT IS OWNED BY PID $i ";fi;done 2>/dev/null
sockname: AF_INET 0.0.0.0 port: 9262
=> PORT IS OWNED BY PID 21326
#
AIX
Here the input to rmsock command should be the output of (Orange text) netstat command.# netstat -Aan |grep 9144
f1000e0006452bb8 tcp 0 0 *.9144 *.* LISTEN
# rmsock f1000e0006452bb8 tcpcb
The socket 0xf1000e0006452808 is being held by proccess 13107448 (java).
#
Linux.
Linux has many options, you can use it based on your convenience.
Option-1
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
httpd 2826 sysweb 3u IPv4 22229 0t0 TCP 10.144.10.138:pcsync-https (LISTEN)
httpd 2855 sysweb 3u IPv4 22229 0t0 TCP 10.144.10.138:pcsync-https (LISTEN)
#
Option-2
# ss -tanp | grep 8443
LISTEN 0 128 10.144.10.138:8443 *:* users:(("httpd",pid=2855,fd=3),("httpd",pid=2826,fd=3))
TIME-WAIT 0 0 10.144.10.138:8443 151.171.71.247:24523
TIME-WAIT 0 0 10.144.10.138:8443 151.171.71.247:27071
TIME-WAIT 0 0 10.144.10.138:8443 151.171.71.248:58763
TIME-WAIT 0 0 10.144.10.138:8443 151.171.71.248:43719
TIME-WAIT 0 0 10.144.10.138:8443 151.171.71.248:9287
TIME-WAIT 0 0 10.144.10.138:8443 151.171.71.248:58095
TIME-WAIT 0 0 10.144.10.138:8443 151.171.71.247:2359
#
Option-3
# fuser -v -n tcp 8443
USER PID ACCESS COMMAND
8443/tcp: sysweb 2826 F.... httpd
sysweb 2855 F.... httpd
#
Option-4
# netstat -nlp | grep :8444
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
tcp 0 0 10.144.10.138:8444 0.0.0.0:* LISTEN 2029/httpd