When troubleshooting STAS authentication, which log file should you review on the Sophos Firewall?

When troubleshooting STAS (Sophos Transparent Authentication Suite) authentication on the Sophos Firewall, the appropriate log file to review is the "auth.log." This log file specifically records events related to user authentication and access, which is crucial when diagnosing issues with STAS. It contains detailed information about successful and failed authentication attempts, making it an essential resource for understanding authentication flows, errors, and user activity related to STAS.

While other log files like the csc.log, user.log, and web_activity.log could contain information relevant to user sessions or activities, they do not specifically focus on authentication processes. For example, csc.log is typically associated with content filtering operations, user.log may provide activity details but lacks authentication specifics, and web_activity.log deals with web traffic and site access rather than authentication events. Thus, auth.log is the most relevant log for addressing STAS authentication issues effectively.