---
title: "Service Accounts (Configure Database Mirroring Security Wizard) | Microsoft Docs"
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ms.date: "05/17/2016"
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# Service Accounts (Configure Database Mirroring Security Wizard)
  When using Windows Authentication, if the server instances use different accounts, specify the service accounts for [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)]. These service accounts must all be domain accounts (in the same or trusted domains).  
  
 If all the server instances use the same domain account or use certificate-based authentication, leave the fields blank. Simply click **Finish**, and the wizard automatically configures the accounts based on the account of the current wizard.  
  
> [!IMPORTANT]  
>  If the database mirroring endpoints of the server instances are configured to use certificates, you must leave the service account fields empty.  
  
 **To configure database mirroring by using SQL Server Management Studio**  
  
-   [Establish a Database Mirroring Session Using Windows Authentication (SQL Server Management Studio)](../../database-engine/database-mirroring/establish-database-mirroring-session-windows-authentication.md)  
  
-   [Start the Configuring Database Mirroring Security Wizard (SQL Server Management Studio)](../../database-engine/database-mirroring/start-the-configuring-database-mirroring-security-wizard.md)  
  
## Options  
 **Principal**  
 Specify the service account of the principal server instance. Enter the domain name in upper case:  
  
 *DOMAINNAME*\\*username*  
  
 **Mirror**  
 Specify the service account of the mirror server instance. Enter the domain name in upper case:  
  
 *DOMAINNAME*\\*username*  
  
 **Witness**  
 Specify the service account of the witness server instance. Enter the domain name in upper case:  
  
 *DOMAINNAME*\\*username*  
  
## See Also  
 [Database Properties (Mirroring Page)](../../relational-databases/databases/database-properties-mirroring-page.md)   
 [Start Database Mirroring Monitor (SQL Server Management Studio)](../../database-engine/database-mirroring/start-database-mirroring-monitor-sql-server-management-studio.md)   
 [Database Mirroring (SQL Server)](../../database-engine/database-mirroring/database-mirroring-sql-server.md)   
 [Set Up Login Accounts for Database Mirroring or Always On Availability Groups (SQL Server)](../../database-engine/database-mirroring/set-up-login-accounts-database-mirroring-always-on-availability.md)