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SQL Server 2008 Windows Auth Login Error: The Login Is From An Untrusted Domain

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When attempting to connect to a SQL Server 2008 Instance using Management Studio, I get the following error:

Login failed. The login is from an untrusted domain and cannot be used with Windows authentication. (Microsoft SQL Server, Error: 18452)

I can login using SQL Authentication without problem. I've been getting this error all of a sudden. I have Mixed Mode Authentication turned on.

Does anyone have any experience with this?

Additional Info: 64-bit version of SQL Enterprise Edition On Windows 2003 Server

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Answer

The issue was caused by a down Active Directory Server, which of course could not authenticate the Windows account. Thank you for your assistance.

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source: stackoverflow.com
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