Quoth Dan White: 'Are you asking how to block all access to your server except for port 25? Could you clarify what activities you are trying to prevent?' These entries, May 10 04:10:44 monolake vsftpd: pam_succeed_if(vsftpd:auth): error retrieving information about user Administrator May 10 04:10:44 monolake vsftpd: pam_unix(vsftpd:auth): check pass; user unknown May 10 04:10:44 monolake vsftpd: pam_unix(vsftpd:auth): authentication failure; logname= uid=0 euid=0 tty=ftp ruser=Administrator rhost=219.232.225.213 of which I am finding tens of thousands daily in /var/log/secure. I hope you're laying off the Twinkies.
