By default Anonymous FTP is enabled in Solaris 9/10 server .
in order to disable anonymous FTP just add guestserver keyword to /etc/ftpd/ftpaccess file
no need to bounce services .Changes will take place immediate
echo "guestserver" >> /etc/ftpd/ftpaccess
Then try ftp as anonymous ,you will get error message like below
$ftp serverip
Connected to T2000 FTP server ready
User (129.227.159.23:(none)): anonymous
530 Guest login not allowed on this machine.
Connection closed by remote host.
$