3.2.6 Timer Events

The Kerberos V5 protocol requires the client to contact the KDC and recognizes that a specific KDC could be offline or unavailable to service the request. The actual behavior is not specified in [RFC4120]; these behavior details are determined by the implementation. Detection of a KDC's failure to reply requires a timer. Clients can use the initial time-out and increase the time-out by some interval to retry multiple times before failing the AS-REQ or TGS-REQ message.<33>