The jail for the SSH service is sshd, so to check if there are banned IPs you can use: sudo fail2ban-client status sshdĪnd to unban some IP a.b.c.d: sudo fail2ban-client set sshd unbanip a.b.c.d If your distro includes fail2ban, which protect services adding rules to the iptables firewall, you could check which services or "jails" are supervised using the command: sudo fail2ban-client status These monitors check the log files looking for failed attempts and add filters to block IP addresses that have too many failures (the number is configurable and independent from the sshd config). Increase MaxAuthTries value on the SSH server in /etc/ssh/sshd_config (not recommended).Īs mentioned in another answer, some Linux distros include monitors to protect from brute force attacks on external visible services like SSH, for example DenyHosts or fail2ban.Note: if you choose to use only the second option, and try to use ssh you will still get errors (if that s what brought you here), the short version will not give the errors, you can also use both options so you can ssh without the errors.
You then connect to the server with: ssh short You can also set the user so you don't need to enter it on the command line and shorten long FQDN's too, see this example: host short ssh -i /path/to/id_rsa Specify Host/IdentityFile pair in /home/USER/.ssh/configĪ single host in the config file should look something like this: Host.This situation can be solved by these ways: It happens so that Your client is trying to authenticate with all possible keys stored in /home/USER/.ssh/. "Too many Authentication Failures for user root" means that Your SSH server's MaxAuthTries limit was exceeded.
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