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In Odoo 11, if your user cannot see other users in the Users dashboard (http://your.domain.com/web?&debug=#view_type=list&model=res.users&menu_id=67&action=65), make sure you uncheck the " Portal " and " Public " in the Other Extra Rights section in that user's setting:

To allow only some specific users/groups access the SSH server: $ sudo nano /etc/ssh/sshd_config Add the following line to allow access only for user 'trinh': AllowUsers trinh Or this line to allow only group 'mygroup': AllowGroups mygroup Restart ssh service: $ sudo service ssh restart More options (source: http://knowledgelayer.softlayer.com/learning/how-do-i-permit-specific-users-ssh-access) : AllowGroups This keyword can be followed by a list of group name patterns, separated by spaces.If specified, login is allowed only for users whose primary group or supplementary group list matches one of the patterns.`*' and `?' can be used as wildcards in the patterns.Only group names are valid; a numerical group ID is not recognized.By default, login is allowed for all groups. AllowUsers This keyword can be followed by a list of user name patterns, separated by spaces.If specified, login is allowed only for user names that match one of the ...