I am trying to change the Jenkins port from default 8080 to port 80.

so I modified the file `/etc/sysconfig/jenkins` and changed the variable `JENKINS_PORT="8080"` to `JENKINS_PORT="80"`.

after changing the port I restarted jenkins service by `systemctl restart jenkins` and the service status was `Active: active (exited)`.

I changed the port back to `8080` and after restart the service status was `Active: active (running)`which is good, I also tried to change the port to 8081 and the service status was `Active: active (running)` as well, just when I am trying to use port 80 the service status is `Active: active (exited)`.

I tried to verify if port 80 is in use using `netstat -pnltu | grep -i "80"`
and the port not in use, I tried to configure port 83 just for testing and I get the same behavior as port 80 configured (`Active: active (exited)`)

Am I missing something here?