my os is freebsd 7.1
just open sshd and hide the sshd banner
nessus still report correctly the os type
how to hide os type from scaning of nmap or nessus?

Thanx so much.

my ipfw rule:
ipfwcmd="ipfw -q add allow tcp"
localip="192.168.1.254"
$ipfwcmd from any to $localip 22 in setup keep-state