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SQL Servers (Principal, Mirror & Witness) must be in a Domain.
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Configure SQL Server Service with the Domain Administrator Account.
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Go to the SQL Server Configuration Manager. Select SQL Server Services
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In the right pane, right-click on SQL Server (MSSQLSERVER). Select Properties.
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Click on Log On tab, select This Account radio button, and click on Browse to select the Domain Administrator Account.
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Click OK. Restart the service.
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As the SQL Server service is configured with Domain Administrator Account, the user needs to configure the Security Login with the same account.
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Open SSMS in the Object Explorer, expand the Security tab.
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Right-click on Login, then select New Login. Click on the Search button to select the Domain Administrator Account.
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