User certificate with addition UPN suffix

Federico Coppola 1,181 Reputation points

Hi all,
In our company we use user certificate to login client to VPN SSL access.
Company firewall is integrated with local Certification Authority.
The system works fine at the moment, however we added an additional UPN suffix.

Employees UserPrincipalName is .local, but we added additional UPN suffix to change UserPrincipalName in " .com", so UPN and mail are the same.
Can I generate user certificate using addition UPN suffix instead of the original one?

CA VM runs Windows Server 2016 Datacenter.

Thanks a lot

Windows Server Security
Windows Server Security
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
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  1. Federico Coppola 1,181 Reputation points

    any suggestions?

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  2. Bertrand PERRET 61 Reputation points


    I think this can help you :


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  3. Daisy Zhou 21,046 Reputation points Microsoft Vendor

    Hello FedericoCoppola-2569,

    Thank you for posting in our Q&A forum.

    Q:Can I generate user certificate using addition UPN suffix instead of the original one?
    A: I think it should be OK.

    For example:

    1-My domain name is

    2-I set Alternative subject name on certificate template.

    3-I add a.local as addition UPN suffix.

    4-I issue user certificate to Administrator using CA with different UPN suffix.

    To make sure this change is feasible, we recommend that you test it out with a test account.

    That is, copy the original certificate from the user store, then delete the original certificate, store only the new certificate with new addition UPN suffix, and then check if you can use the VPN.

    If everything is OK, you can make this change on all the users.

    Hope the information above is helpful.

    Best Regards,
    Daisy Zhou


    If the Answer is helpful, please click "Accept Answer" and upvote it.

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