Windows Server 2008 R2 Certificate Authority Renewal

Our CA will be expiring in December, and we will be renewing and upgrading to SHA2.  I have all the steps with regards to upgrading to SHA2 and renewal.
My question is do I need to go in and revoke the old certificates and how to push out the renewed/upgraded cert.

Thank you,
trinity2007Asked:
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Tom CieslikIT EngineerCommented:
When you renew CA certificate and new one will become trusted and valid then server will stop using old one.
You revoke old certificate then. Do not revoke old CA certificate prior to renewal.
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Jakob DigranesSenior ConsultantCommented:
you do not need to revoke old certificates, as long as the old ROOT certificate and an valid CRL is available - the old certificates would still work. Since this is Enterprise CA the root certificate is published to AD (AIA path). But you MUST create and publish a CRL that is valid until the last certificate published with the old SHA1 cert
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trinity2007Author Commented:
Thank you Jakob, how do I create and publish a CRL?
Sorry, new to the CA renewal process.
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Jakob DigranesSenior ConsultantCommented:
in certification authority - right click CERTIFICATE REVOCATION and choose PROPERTIES and set publication interval for CRL. Then right click again and choose PUBLISH
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trinity2007Author Commented:
Perfect!  Thank you!
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trinity2007Author Commented:
One more question for you.  We have a user and computer certificate which we publish for Cisco ISE security.  Will I need to re-create those from a template before publishing
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Tom CieslikIT EngineerCommented:
You don't need renew any certificates that are not or about to expire soon.
Check how long this certificate is valid and decide when you should renew this certificate.
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trinity2007Author Commented:
OK I have those set to expire yearly, but auto-renew...
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Jakob DigranesSenior ConsultantCommented:
Yup

old certificates will use old root and old CRL, while new ones will user new root and new CRL. no prob
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Windows Server 2008

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