without warning yesterday our Exch 2003 SP2 server dropped off the domain
the first we knew was users complaining that email isn't working
We have a win 2008 R2 PDC and a Win 2003 SP2 BDC
In the logs of the 2003 BDC is event id 5723 (NETLOGON):
Event Type: Error
Event Source: NETLOGON
Event Category: None
Event ID: 5723
The session setup from computer 'BHS-MS-001' failed because the security database does not contain a trust account 'BHS-MS-001$' referenced by the specified computer.
If this is the first occurrence of this event for the specified computer and account, this may be a transient issue that doesn't require any action at this time. Otherwise, the following steps may be taken to resolve this problem:
If 'BHS-MS-001$' is a legitimate machine account for the computer 'BHS-MS-001', then 'BHS-MS-001' should be rejoined to the domain.
If 'BHS-MS-001$' is a legitimate interdomain trust account, then the trust should be recreated.
Otherwise, assuming that 'BHS-MS-001$' is not a legitimate account, the following action should be taken on 'BHS-MS-001':
If 'BHS-MS-001' is a Domain Controller, then the trust associated with 'BHS-MS-001$' should be deleted.
If 'BHS-MS-001' is not a Domain Controller, it should be disjoined from the domain.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp
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A similar event occurs in the exchange server logs. Curiously there aren't any events in the 2008 R2 PDC logs which relate to the Exchange server.
What we have tried (three times):
Remove Exch Server (BHS-MS-001) from Domain. <reboot>
Remove BHS-MS-001 from AD (both DCs)
Add BHS-MS-001 back in to domain <reboot>
Server takes an age to start, especially at applying computer settings stage.
After start, still not working.
Because this is an Exchange Server is there something extra which needs to be done? I've seen mention elsewhere of trust relationships, but am unsure how to check if those are in place. Are there authentication settings which need to be verified?