Administrative user accounts have been defined on the remote LDAP server and are unable to log in to the BIG-IP device. Which log file should the BIG-IP Administrator check to find the related…

The /var/log/secure file on BIG-IP devices records security-related events, including login attempts, authentication failures, and other access control messages. Problems with LDAP authentication for administrative users would be logged here.

The /var/log/messages file contains general system messages but is not specifically dedicated to security or authentication issues.

The /var/log/ltm file is specific to the Local Traffic Manager (LTM) module and records events related to virtual servers, pools, and nodes, not user authentication.

The /var/log/user.log is a general log file often used for user-space programs, but /var/log/secure is the standard for authentication/authorization specific events on Linux-based systems like BIG-IP.