Windows cannot verify that the user name is unique because the following error occurred while contacting the global catalog:Logon failure: unknown user name or bad password.

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Active Directory Domain Services
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Windows cannot verify that the user name is unique because the following error occurred while contacting the global catalog:Logon failure: unknown user name or bad password.Windows will create this user account, but the user can log on only after the user name is verified to be unique. Make sure the global catalog is available. For more information about troubleshooting this issue, see Windows Help.


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OK   
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