Importing the WSTEP certificate chain
Import the WSTEP certificate chain into the GPO previously created in Creating a Group Policy Object.
ℹ See Downloading the certificate chain for how to download the required certificates.
To import the certificate chain into the GPO:
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Log in to the root Active Directory of the forest as an Active Directory administrator.
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Select Start > Windows Administrative Tools > Group Policy Management to open the Group Policy Management dialog.

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Right-click the Group Policy Object.
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Select Edit to display the Group Policy Management Editor.

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Navigate to Computer Configuration > Policies > Windows Settings > Security Settings > Public Key Policies.
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Right-click Trusted Root Certificate Authorities and select Import.

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In the Certificate Import Wizard, click Next and select the root CA certificate file to import.
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Click Next to reveal the Certificate Store settings.

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Verify that the selected certificate store is Trusted Root Certification Authorities.
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Click Next to display the Completing the Certificate Import Wizard.
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Click Finish to return to the Group Policy Management dialog.
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In the Group Policy Management dialog, navigate to Computer Configuration > Policies > Windows Settings > Security Settings > Public Key Policies.
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Right-click Intermediate Certificate Authorities and select Import to display the Certificate Import Wizard.
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Click Next and select the issuing CA certificate file to import.
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Click Next to reveal the Certificate Store settings.
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Verify that the selected certificate store is Intermediate Certification Authorities.
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Click Finish.
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Select File > Exit to close the Group Policy Management Editor.