system can't log you on now because the domain is not available

First of all,
check the windows firewall on domain server 2008, turn it off or modify it to allow logon
1) check DNS server and ensure that u have the entries for all the hosts.
2) On each system try using ipconfig/flushdns and ipconfig/registerdns
3) If the above two does not work then the final try would be reset the password of each account that does not allow u to login. I mean goto AD users and computers and reset the password for each account and have the users relogin.
I hope this will resolve the issue.

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