Port is in use but pid not visible
Problem #
A port is being used by some process but the pid of process is not visible
Reason #
When the process is started by root, other users not in the root group cannot view the process ids. So when you do:
netstat -atnp
process id will not be visible to normal user.
You have to run netstat command with sudo, to view all process ids.
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A scenario I came across is when Apache tomcat was started as a Java service with jsvc command. The daemon.sh was run by the root user, so the process belonged to root.
it is used by root jsvc.exec usses 8080 centos security cannot see pid of process run by root