Allow / Block ssh / sftp for specific Users / Group

Allow ssh / sftp to selected users
If you want to give ssh / sftp privileges to certain users, here is the solution.
Add following line in the file /etc/sshd_config
AllowUsers username1 username2 username3
If you want to allow certain groups only, add following line in /etc/sshd_config
AllowGroups username1 username2 username3
Restart service ssh.

Block ssh / sftp for selected users
If you want to restrict certain users to access ssh / sftp, here is the solution.
Add following line in the file /etc/sshd_config
DenyUsers username1 username2 username3
If you want to block certain groups only, add following line in /etc/sshd_config
DenyGroups username1 username2 username3
Restart service ssh.

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