I have a conflict between the mail server and one more service.
netstat -ltnp | grep -w ': 25'Conclusion:
(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) tcp6 0 0 ::: 25 ::: * LISTEN - The problem is that I do not know who is listening on port 25. How can this be determined?
I fixed it:
sudo netstat -tulpn | grep LISTEN [sudo] password for eurvanov: tcp 0 0 127.0.0.1:63342 0.0.0.0:* LISTEN 2967/java tcp 0 0 127.0.0.1:5939 0.0.0.0:* LISTEN 1445/teamviewerd tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 583/systemd-resolve tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 709/cupsd tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 7935/master tcp 0 0 127.0.0.1:9050 0.0.0.0:* LISTEN 955/tor tcp 0 0 127.0.0.1:6942 0.0.0.0:* LISTEN 2967/java tcp 0 0 0.0.0.0:45577 0.0.0.0:* LISTEN 2967/java tcp6 0 0 ::1:631 :::* LISTEN 709/cupsd tcp6 0 0 :::25 :::* LISTEN 7935/master tcp6 0 0 :::10012 :::* LISTEN 2199/docker-proxy
Answer
You can’t see processes in deprecated netstat (or current ss) output if you are not root and aren’t the process owner.
To see the process information for all processes, you need to run it as root, e.g. with sudo. For example:
sudo netstat -ltnp | grep -w ': 25'
Attribution
Source : Link , Question Author : hedgehogues , Answer Author : Michael Hampton
