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Upgrading server certs through CA on Active Directory

I am trying to change a template or replace it that Active Directory CA holds.  Currently my test server (Server 2003) is being issued a cert that is 1024 for Client Authentication and Server Authentication.  I want to change this to 2048.  Since the CA controls this I need to perform it their and then have this pushed out.  How do you change the template used so that the servers will get a new 2048 cert and AD CA knows to use this updated template.
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Will Szymkowski
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Thanks Will.  So after doing this how do you tell the CA to not use template A(original) and start using Template B(new copy using 2048) for the server or servers?
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Will Szymkowski
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If you reference one of the screenshots you need to "Revoke" the certificate and then issue the new one you created.

Will.
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Thanks Will