Ray,
Have a look at this article.
http://support.microsoft.com/?kbid=898060
"Ray Johnson KLG" wrote:
> Configuration:
>
> “LAN A� is behind Watchguard firebox x700 and contains 2 Windows 2003
> servers and 1 Windows 2003 Exchange server.
>
> “LAN B� is behind a Watchguard soho6 and contains 1 Windows 2003 server and
> 1 Windows 2003 Exchane server.
>
> “LAN C� is “LAN B� is behind a Watchguard soho6 and contains 1 Windows 2003
> Exchane server.
>
>
> Problem:
>
> Within a 48-72 hour time frame any given server may experience this error
> message in the event log:
>
> Source: NTDS KCC
> Category: Knowledge Consistency
> Event ID 1865
>
> This error usually has the communication issue with the server from "LAN C".
> It may also continue in this state from 3 hours to 2 days. The server will
> then refuse access from any device not on it's local area network. However I
> can ping the IP address of that server from the LAN and WAN.
>
> My temporary solution has been to reboot the server on "LAN C" and the
> server having the issue. After rebooting both servers all is fine until it
> happens again.
>
> I have reconfugred the DNS zone and it replicates to all DC's just fine. I
> have removed the ntds settings from all servers in AD Sites and Services and
> allowed AD to automatically generate connections. I have tried a few other
> things but the problem still persists. Any ideas?
>
> Ray
>
>