Thanks @shaunak !
Here is the out-put of sudo lsof -i :514
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
rsyslogd 14289 root 3u IPv4 51284 0t0 UDP *:syslog
rsyslogd 14289 root 4u IPv6 51285 0t0 UDP *:syslog
rsyslogd 14289 root 5u IPv4 51288 0t0 TCP *:shell (LISTEN)
rsyslogd 14289 root 6u IPv6 51289 0t0 TCP *:shell (LISTEN)