Using SSH AllowUsers directive requires careful configuration to avoid lockouts

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The OpenSSH AllowUsers directive provides server-side access control by specifying which user accounts can connect via SSH. This setting must be placed in the active SSH server configuration, not in client-side configuration files. Administrators must ensure all necessary accounts including administrators, automation, and recovery logins are included before applying the rule. A typo or incomplete list in the AllowUsers directive can lock out authorized users even with valid credentials. Testing configuration syntax and maintaining existing connections during changes is recommended to prevent accidental lockouts.

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