This read-write value, in seconds, sets the serverTimeout constant used by the Backend Authentication state machine to bound how long the switch waits for a reply from the RADIUS authentication server. Admins raise or lower it to match the RADIUS server's real response time, since setting it too low causes valid logins to fail with spurious timeouts. For example, an admin might raise this from the 100-second default toward 300 if the RADIUS server is across a high-latency WAN link.