Due to some security reason, you may require to block certain user SSH access to Linux box.

Edit the sshd_config file, the location will sometimes be different depending on Linux distribution, but it’s usually in /etc/ssh/.

Open the file up while logged on as root:

vi /etc/ssh/sshd_config

Insert a line to end of the config file:-

DenyUsers username1 username2 username3 username4

Save it and restart SSH services. Basically username1, username2, username3 & username4 SSH login is disallowed.

Run below command to restart the same:-

systemctl restart sshd

The requirement has been done. Please take the ssh from that users and your will get error " Access Denied"

Thank You

Due to some security reason, you may require to block certain user SSH access to Linux box.

Edit the sshd_config file, the location will sometimes be different depending on Linux distribution, but it’s usually in /etc/ssh/.

Open the file up while logged on as root:

# vi /etc/ssh/sshd_config 

Insert a line to end of the config file:-

DenyUsers username1 username2 username3 username4 

Save it and restart SSH services. Basically username1, username2, username3 & username4 SSH login is disallowed.

Run below command to restart the same:-

# systemctl restart sshd 

The requirement has been done. Please take the ssh from that users and your will get error "Access Denied"