http://msmvps.com/blogs/ad/archive/2008/11/06/kdc-11-error-in-the-system-event-log.aspxI ran into this error awhile back after building a new root level Domain Controller (DC). My initial health checks panned out ok but after about an hour the following should up in my System Event log: Event Type:    Error Event Source:   enCommunityServer 2008.5 SP2 (Build: 40407.4157)