If you disable/uncheck the IPv6 on the NIC it will show the status unavailable.
Enabled it shows "online".
So you have either let it enabled or stop all about IPv6:
http://support.microsoft.com/default.aspx/kb/929852
Choose 5.b and it will also show online after the reboot.
Best regards
Meinolf Weber
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> When I tried to transfer Operations master roles to windows server 2k8
> DC using schema snap-in, I noticed the the status on Windows Server
> 2008 AD DS shows "Unavailable" while others show online. I researched
> it but couldn't get any positive answers. Many said they had the same
> problem, but didn't worry about it because the server works just fine
> and don't have any explanations for it. I would appreciate if you can
> give me a clue what this is? or how to change it from unavailabe to
> online.
>