radiusAcctServer is a DisplayString reporting the reachability of the configured external RADIUS accounting server, flagging when it is not configured or in error. Because RADIUS accounting logs session usage for billing or auditing, an admin seeing this alert knows connection-accounting records are not being captured even if user authentication itself may still work. For example, "Alert: RADIUS Accounting Server: Error" would prompt the admin to check network connectivity or credentials to the accounting server before compliance reports show gaps.