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CA server migration from Windows 2003 to Windows 2012 R2

I have an internal root CA server that runs on Windows 2003, standalone, not connected to the network to issue SHA-1 certificates. Is it possible for me to have another internal root CA server running on Windows 2012 R2, standalone, not connected to the network to issue SHA-2 certificates?

This is so I can generate SHA-1 for legacy applications using existing CA and generate SHA-2 using new CA for the application those are currently using SHA-1 but can support SHA-2.

What is the best practice for achieve this? Will both root CA servers run on different names or same name. Can someone please advise me the step by step to achieve this? I want to migrate to SHA-2 but at the same time I don't want to affect my existing root CA.

Also, How will I renew the certificates of the existing applications using the new Windows 2012 R2 CA so they can use SHA-2?

Many Thanks
Windows Server 2012Windows Server 2003Windows Server 2008EncryptionSecurity

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8/22/2022 - Mon

If you standup another Stand-Alone I do not think it will be an issue.
You will need to push out your new CA as a root CA for new renewals.
Once you have that pushed you can generate a new CSR to register for a new Cert.

What type of applications are you using this for?  If the only machine that has the cert is the server I am not seeing any issues.

I would like to have a little more insight on the project.

The certificates are used for ISA/Exchange/Active Directory all 2003 bases where I will install the hotfix of SHA2. I also have couple of lagacy web based applications and old firewalls that will require SHA1 for the time being.
Can you please let me know the steps to push out your new 2012 CA as a root standalonr CA for new renewals.
Should it have the same name as the Windows 2003 CA server and it requires a CA config backup to be taken from 2003 and restored to 2012
OR this can be a new name with a fresh config.
My current CA server is not connected to any network and I use USB to copy the issued certificates.

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If you can please provide some more info on the following:

what are the steps to export the private key and replace the ceritifate?
what are the steps to issue out the new Root CA cert to all clients?

Also, can you please confirm the final steps:

Install new standalone server (2008 R2 or 2012 R2)

Install CA services and configire it as Root CA

Put new Root CA cert to the clients that will support SHA-2 (Please provide the steps or link if possible)

Export the private key and replace the ceritifate.(Please provide the steps or link if possible)

Issue out the new Root CA cert to all clients.(Please provide the steps or link if possible)

Keep using Windows 2003 CA for lagacy applications we are using now.

I know I am asking for a lot of information so I will try to maximize the points when closing the case.
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William Peck

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thanks so much :)

Hi yo_bee,

Can you please have a look at this today.

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I am pretty busy with my job and will not be able to.

Since this is a stand alone CA there are no harms buy standing up another Stand-alone CA in your infrastructure.

What I would do for testing is setup a test IIS server and request a cert from your current CA.
Once confirmed that the cert is valid request a new cert from your new CA.

Like I said since this is not integrated with your domain you have nothing to working about.
The only thing you want to do is use Group Policy to push out your new Root CA to all clients.

Many Thanks

Did it work?
Your help has saved me hundreds of hours of internet surfing.

I am still in the planning phase so gathering as much information as I can.
Thanks a lot.

Like I said if you stand up another server if will not hurt your environment.