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Comprehensive and Detailed Explanation From BIG-IP A34dministration Control Plane Administration documents: Authentication and authorization events are handled by the system's PAM (Pluggable Authentication Modules). For Control Plane security auditing, all login attempts—whether local or remote (LDAP/RADIUS/TACACS+)—and SSH-related security events are recorded in /var/log/secure. This is the primary log for troubleshooting administrative access issues

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:Reporting device status includes monitoring physical resource exhaustion, such as memory48. The Control Plane provides both a command-line method via TMSH (show /sys memory) and a graphical method under Statistics > Module Statistics > Memory to report on how memory is allocated across TMM and the Linux host494949494949494949. This is essential for identifying potential "Aggressive Mode" triggers or hardware performance bottlenecks50.

Comprehensive and Detailed Explanation From BIG-IP Administration Control Plane Administration documents:

On BIG-IP systems,authentication and authorization eventsare logged in/var/log/secure. This includes:

Successful and failedSSH login attempts

Invalid user authentication attempts

PAM (Pluggable Authentication Module) authentication failures

Access denials related to secure services

Why the other options are incorrect:

/var/log/messagescontains general system messages and service events, not detailed authentication failures.

/var/log/auditrecords administrative configuration changes (who changed what and when), not login attempts.

/var/log/ltmlogs traffic-management (TMM) and application-related events.

Therefore, the correct log file for investigatingunauthorized SSH login attemptsis/var/log/secure.

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