This read-write integer sets the maximum number of seconds an HTTP web-management session may sit idle, with no new request, before the device closes the connection, with 0 disabling the idle timeout entirely. An administrator tunes this to automatically log out inactive HTTP sessions for security, or disables it in environments where persistent management connections are preferred. For example, setting this OID to 900 would automatically close an HTTP admin session that's been idle for 15 minutes.