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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. &nbsp;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). &nbsp;We are thinking using a wildcard certificate or SAN certificate to cover both Site A &amp;&nbsp;Site B. Our question is what is the suggested migration methods. <br />
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Q1. Shall we apply for the Wildcard/SAN Certificate (for both vpn1.company.com.hk &amp;&nbsp;vpn2.company.com.hk) then replacing the existing single domain cert on Site A and install it on Site B ?<br />
<br />
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 ?<br />
<br />
We are a bit new on these subject and appreciate would anyone shed some lights on this. <br />
<br />
Thank you so much<br />
Respectfully,<br />
Patrick
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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

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

Security is the protection of information systems from theft or damage to the hardware, the software, and the information on them, as well as from disruption or misdirection of the services they provide. The main goal of security is protecting assets, and an asset is anything of value and worthy of protection.  Information Security is a discipline of protecting information assets from threats through safeguards to achieve the objectives of confidentiality, integrity, and availability or CIA for short. On the other hand, disclosure, alteration, and disruption (DAD) compromise the security objectives.

Security

HTTPS is a protocol for secure communication over a computer network which is widely used on the Internet. HTTPS consists of communication over Hypertext Transfer Protocol (HTTP) within a connection encrypted by Transport Layer Security (TLS) or its predecessor, Secure Sockets Layer (SSL). The main motivation for HTTPS is authentication of the visited website and to protect the privacy and integrity of the exchanged data. HTTPS is widely used for protecting page authenticity on all types of websites, securing accounts and keeping user communications, identity and web browsing private.

SSL / HTTPS

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.