I am running a small domain, based on Windows 2003 Server, with Exchange 2003 SP2 - everything on one physical machine.
Recently I added another physical machine, which is installed with Windows Server 2008, and did a DCpromo into the existing domain.
I also have moved all the 5 AD roles to the new AD server, made it Global Catalog, DNS and WINS server.
Afterwards I did an Exchange 2003 to 2007 migration (to a virtual HyperV server on the new machine), and removed all the Exchange software on the old machine.
Everything runs perfectly (it seems) regarding AD and the new Exchange.
However, something is odd anyway, when I try to Demote the old 2003 Server, it tells me it can't contact other DCs in the domain etc.
I decided not to do any force removal, as this might cause other not yet know issues to the domain - instead I simply shut down the old 2003 DC to see how things were running with only the 2008 AD server holding all the roles, DNS, WINS etc.
Nothing seems to be working then, can't log on to the domain from a client, no webserver sites works from outside etc. etc.
As soon as I turn the old server back on, things starts running again.
I am pretty sure I haven't missed out anything - even followed a well written guideline about doing this migration from A-Z.
... but, obviously something has gone bad :-)
Anyone able to assist on this problem, as it would be very very nice to demote the old server and shut it down for good?