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Enterprise Microsoft Certificate Authority

Posted on 2008-06-17
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Last Modified: 2008-07-15
I am in the process of implementing Enterprise Certificate Authority on our network. Though, on our network, we already have another 2 enterprise CAs. We only want laptop OUs on our Active Directory to be able to get certificate from this new CA.

How do we configure the new CA so that only the laptop OUs get certificate from the new Certificate Authority? At the same time, laptops on the laptops OUs won't get any certs from the other two Certificate Authority?
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Question by:dongocdung
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Expert Comment

by:arnold
ID: 21807340
You can configure a GPO policy in
computer settings\windows settings\security settings\public key policies\.

Is the New CA you are setting up a delegated one of the existing ones.
i.e.
somedomainexample.com is the DC CAs.
The new one is
laptops.somedomainexample.com?

http://technet2.microsoft.com/WindowsServer/en/library/2d82decb-6726-4c5c-b872-1658b0fc3e3e1033.mspx
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Author Comment

by:dongocdung
ID: 21809745
Arnold:

Thank you for your info.

Though can you be a little bit more specific of what we have to do. For example, what do we have to do exactly on Group Policy?

By the way, this new CA is a brand new CA, not a delegated one of the existing ones.

Thanks
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Expert Comment

by:arnold
ID: 21810346
Not sure why you would want to have two separate CA's since you would run into problems (certificate validity).
Is the new CA also a DC?
In the GPO you can import the CA's certificate.

Are you planing on having the systems automatically enroll or do you plan on generating and submitting the requests?
The auto-enroll option does not include a place where you can define to which CA to submit the request.
I think the action will be to submit the request to the DC-CA, but unsure whether the existing CA will supersede the newly created one.
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Author Comment

by:dongocdung
ID: 21812243
Can we use permission to restrict access?

For example: I can go to Site and Services/Services/Public Key Services/Certificate Authorities and then go to Security. Right click on the new Certificate Authority. Remove authenticated users and then add in laptops users OU.

Can I do that?
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arnold earned 2000 total points
ID: 21812408
You can and should, however, I am not sure how you would force the laptops to submit the request to a specific host if it is not the DC against which they authenticate.
You might have to configure the existing CA to forward the certificate request for the laptops to the new CA.
If you manually generate the request, you might be able to specify to which CA you would like the request submitted.
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Expert Comment

by:arnold
ID: 21812899
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