Win2003R2 Server (Old DC now demoted to Backup DC)
Win2008R2 Server (Primary DC - Global Catalog)
Exchange 2003 running on Win2003R2
Installed the Win2008R2 server, promoted to PDC, and old domain controller is now just a backup domain controller with GC turned off. This is all a prelude to moving to Exchange 2010 (and beyond later).
If the Backup DC is turned off then the following error appears on the Exchange 2003 Server and nothing works :
Event ID 8026 - LDAP Bind was unsuccessful on directory <Old-DC-name> for distinguished name ''. Directory returned error:[0x51] Server Down.
Similarly, if the Backup DC is down (old domain controller) then the Exchange server will just hang while booting until such time that Backup DC is turned back on, the error being the above error.
How can I get the Exchange Server to point to LDAP on the new Win2008R2 DC and GC ?
I have already made the RECIPIENT UPDATE SERVICES point to the new Win2008R2DC/GC.