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What to bring down Current Root CA in Active Directory

Posted on 2011-09-26
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Last Modified: 2012-05-12
Hello,

Here is the scenerio....

We have a Microsoft CA running in the environment to run in conjuction with Exchange 2007, Outlook 2007 clients, as well as Office Communicator 2007. Due to naming and multiple role on the same server, I would like to delete the current CA from the AD Domain and start fresh with new a new server, name convention etc..The current setup for the CA is one server performing all CA services. For security reasons I want to seperate and delegate, I am aware of the process of deleting, and revoking such services, but. My first concern is Exchange 2007 and the Outlook client currently using the certs issued to them by the exsiting CA just for client server communications. I guess my question is, Can we delte the current CA server without revoking the certificate for Exchange/Outlook? And bring the new PKI infrastructure online and issue new certs and revoke and delete the old cert post deployment. How is this going to affect client server communication? OWA is not an issue we currently utilizing a mail security appliance that handles the third party cert for OWA. The appliance "tunnels" to OWA so there is no Forms Based Authentication setup at all.  I have googled but getting the right wording and getting results that are relevant is a challange. Any help is very much appreciated
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Question by:brettschwartzunibank
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e_aravind earned 500 total points
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well, if you are planning to delete and recreate the new CA  @ your infrastructure...go ahead and proceed with the same.

1. Exchange for the autodicsover,EWS needs a certificate
If this cert is from the local CA (not the self-signed one generated by exchange) ...then you may need to re-request for the Cert. again then....submit this request to the new Certification Authority which is going to come-up

2. For all the domain-joined machines with Outlook
The root-CA from the new-CA server will be pushed via the GPO
So no need to worry about the cert. trusting for the Outlook (after 1 day)
IMO, we may need the client-machines to log-off and log-on...else, you may need to restart the client machine to get the new cert.

>> If you are using the mails\message encryption using the old. cert then you need to be very careful in removing the old entries from the client machine...else you can have another bunch of un-related certs. @ the client and exchange-cert. (clean-up is not a mandatory!)
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by:brettschwartzunibank
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In number 2 when you say GPO, you are referring to AutoEnroll correct......?

And I can safely assume that bringing down the old and coming up with the new is not going to break or ceace operations client/server?

Thanks,


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by:e_aravind
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Yes the default AutoEnrollement which pushes the current-CA's root certificate to all of the domain-joined client machines.

The only challenge would be @ the non-domain joined machines...which would start showing-up the cert. warnings.
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by:brettschwartzunibank
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Thank you
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