When logged into a RHEL 5 virtual machine /as root/ Running `fuser 22/tcp` doesn't return a result even though `netstat -natp` clearly shows sshd is listening on that port. The customer has reproduced this on other machines and at one time claimed other ports were not showing up as well, although sshd's port is the only one that consistently does not appear.

psmisc 22.2-7