hostserver:~# lsof | grep *:6343
sflowtool 979324 root 3u IPv6 1443815323 0t0 UDP *:6343
hostserver:~# netstat -ntlup | grep 6343
udp6 0 0 :::6343 :::* 979324/sflowtool
hostserver:~# fuser 6343/udp
Cannot open a network socket.
hostserver:~# fuser -n udp 6343
Cannot open a network socket.
hostserver:~# fuser -v -n udp 6343
Cannot open a network socket.
fuser is not listing the Process. What would be wrong here?