Forum OpenACS Q&A: Response to Help! no SSH Telnet Access

Another recommendation. Move ssh to a different port. Port 22 is too obvious. It's the first place they'll look. Pick a five digit number (but less than 65536). Make them work for it.

If you have a couple of locations with static IP addresses then put in ipchains rules to restrict access to the port you selected with ssh to only those IPs.

Remove ftp from your servers. use scp for file transfer or look into the new gftp that supports sftp. http://gftp.seul.org