By default, the Microsoft System Center Configuration Manager 2007 PXE service point uses its computer$ account when reading information from the site database, but you can configure a user account instead. Typically, you would need this account if the PXE service point needs to access a site database in a remote, untrusted forest. For example, if your data center has a secure perimeter network in a forest other than the site server and site database, you can use this account to read the PXE boot information from the site database.
To specify the PXE Service Point Database Connection Account
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In the Configuration Manager console, navigate to System Center Configuration Manager / Site Database / Site Management / <site code> - <site name> / Site Settings / Site Systems / <PXE service point name>.
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In the results pane, double-click ConfigMgr PXE service point.
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In the ConfigMgr PXE service point Component Properties dialog box, on the Database tab, for the PXE Service Point Database Connection Account, click Set.
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In the Windows User Account dialog box, specify an existing Windows domain user account and password, and then click OK.
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Click OK.