all PC's unable to login after restore AD backup

Hi Expert
i have win server 2003 AD
after critical error i restore old backup 3 months ago
after that all PC's unable to login the error message "the domain not available"
MASWORLDAsked:
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Luis MouraCommented:
Hi

Did you try in one machine, remove from domain and add again!?
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Larry Struckmeyer MVPCommented:
May not be necessary to disjoin/rejoin.  
https://support.microsoft.com/en-us/kb/216393

the most efficient is the one using ADUC and "reset account"
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MASWORLDAuthor Commented:
thanks all
rejoin domain work but i have more than 50 PC's
i search for another way
i still have access to the current AD state can i copy a file to the old backup or some thing like that
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David Johnson, CD, MVPOwnerCommented:
have you tried larry's suggestion, reset account from Active Directory Users and Computers? How many users may have changed their password in the last 90 days? Machine passwords change automatically
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MASWORLDAuthor Commented:
no passwords changed from year a go
and the backup from 3 month's
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Larry Struckmeyer MVPCommented:
the users passwords have not changed but the machine ones change themselves every 90 days so a old backup will require the machine password be reset.  Hence the link I gave you.
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Luis MouraCommented:
You can select all computer accounts on AD, and try disable/enable account.
See if it's works with one test computer.
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