Ubuntu

Allow or Deny SSH access only to a list of users or groups

Allow or Deny SSH access only to a list of users or groups
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vi /etc/ssh/sshd_config

Allow access for users:

AllowUsers user1 user2 user3

Allow access for groups:

AllowGroups group_name

You could also use:

DenyUsers user1 user2 user3

DenyGroups group_nanme

Restart SSH Service:

systemctl restart sshd

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