DEBIAN SSH IP UNBLOCK INSTALL
Installing fail2ban on Ubuntu (and other Debian-based distributions) is straightforward: $ sudo apt install fail2ban Installing fail2ban on Ubuntu Manual installation By analyzing logs, fail2ban discovers repeated failed authentication attempts and automatically sets firewall rules to drop traffic originating from the offender’s IP address. One of such widely-adopted tools is fail2ban ( ). However, if a higher port number is used for SSH, under certain circumstances users with no root access can substitute SSH daemon with another, possibly malicious, service.Ī better way to solve the problem at hand is to use a tool that will block the attacker from accessing SSH server. Typically, only root can bind to port numbers lower than 1024. Moreover, it might create another security vulnerability if the chosen port is greater than 1024. However, it’s not considered good practice - first of all, one has to remember to set a proper non-default port each time they connect to the server.
One approach to minimize the number of brute-force login attempts is to change the default port SSH listens on. While it is unlikely they will succeed, they will still consume your bandwidth and generate massive amounts of logs. However, there are still a lot of bots out there in the wild that tries to find vulnerable hosts by attempting to log in with common compromised usernames and passwords such as root/root or admin/admin. SSH is quite secure, especially if you take reasonable precautions, such as requiring key pair based authentication.
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