I successfully use denyhosts that will automatically blacklist ips after several failed attempts. I now have more than 70 IPs blacklisted. John Merritt wrote: > Hi, > > I get ssh connect attempts all the time, to my servers at home and at > work. I've noticed lately they come from a certain ip address, hitting > every 3 or 4 seconds, trying 50 or 100 different user names and > passwords. And I get these sweeps from 2 or 3 ip addresses a day. I > guess this is an automated attempt to guess a user/pass and break into > a system. > > I tried to secure ssh better by putting in an AllowUsers line in > sshd_config. Then I thought tcp wrappers and just putting in my own > addresses in /etc/hosts.allow would be even better, until I found out > that all mail to my email server would be rejected. > > I have 2 questions. One, is there anything you can do to stop these > attempts, other than not running ssh? > > And two, do those ssh attempts every 3 or 4 seconds slow down a box, > or put any strain on it? > > John > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >