Complete the following steps to grant the Right to access this computer from the network local policy to the SiteAdmins group you just created.
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From the Windows Control Panel, select Administrative Tools > Local Security Policy.
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On the Local Security Settings dialog box, select the User Rights Assignment local policy, and double-click the Access this computer from the network policy.
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On the Local Security Setting dialog box, click Add User or Group and browse to the group you created above (for example, SiteAdmins).