Alternate Domain Controller



I am an admitted Windows Active Directory newbie. Our organization
just built a Windows Server 2003 file server cluster. We have 2 domain
controllers A & B. As far as I know, they don't necessarily act as
"primary" and "secondary" DCs, but more like if one is down, the other
will transparently fill its role. Please correct me if I'm wrong here.

Anyway, since we created the 2nd DC and tested it out by bringing down
the 1st DC, it seems users accessing the file server can only
authenticate when the 2nd DC is up, i.e. users are never relayed to the
1st DC (up again) when the 2nd is down. When logging in with the 2nd
DC down and 1st DC up, I get the following error message:

"There are currently no logon servers available to service the logon
request."

Neither the DC A or B act as DNS servers, but both have update
privileges on our DNS BIND servers. I'm assuming our Active Directory
DNS entries need some tweaking to make the DC A the "active" DC again?
Is there a way to make the DC failover more transparent?

.



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