Migration of Single Domain Certificate to the SAN certificate or WildCard certificate

Currently we have installed a Single Domain digital certificate (related to domain (vpn1.company.com.hk) on our VPN gateway at Site A and it is in operational working fine.  VPN client will be connecting to it thru the domain name (i.e. vpn1.company.com.hk). Moving forward, we are going to install VPN gateways on our resilience site (Or Site B). The domain name for site B will be a bit different (e.g. vpn2.company.com.hk).  We are thinking using a wildcard certificate or SAN certificate to cover both Site A & Site B. Our question is what is the suggested migration methods.

Q1. Shall we apply for the Wildcard/SAN Certificate (for both vpn1.company.com.hk & vpn2.company.com.hk) then replacing the existing single domain cert on Site A and install it on Site B ?

Q2. If we do so as described on Q1, does it mean the original single domain certificate (i.e. for vpn1.company.com.hk only) becomes automatically revoked or useless ?

We are a bit new on these subject and appreciate would anyone shed some lights on this.

Thank you so much
Respectfully,
Patrick
patricktamAsked:
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systechadminConsultantCommented:
Q1. Shall we apply for the Wildcard/SAN Certificate (for both vpn1.company.com.hk & vpn2.company.com.hk) then replacing the existing single domain cert on Site A and install it on Site B ?

Ans:  If you are planning to deploy more sites in future, then yes you should go ahead with WildCard /SAN Certificate. Keep the existing Site Setup as it is, and purchase the WildCard/SAN cert for Site B.

If you want to replace the cert of site A, then you need to generate new CSR and then submit it to Certificate Authority.

Q2. If we do so as described on Q1, does it mean the original single domain certificate (i.e. for vpn1.company.com.hk only) becomes automatically revoked or useless ?

Once you apply the new certificate, old one is automatically revoked. or you you can manually revoke the certificate via CA panel.

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