Zyxel VPN certificate requirements for third-party CA
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Zyxel_Stanley
Posts: 1,481 
Zyxel Employee
Zyxel Employee
Question:
Can a Zyxel firewall establish certificate-based VPN using only Root CA and Intermediate CA certificates?
Answer:
No. Zyxel firewall requires a server certificate that includes a private key (such as .PFX/.P12) imported into My Certificates for VPN authentication. Root and Intermediate CA certificates (such as .CER) are imported into Trusted Certificates only to validate the trust chain and cannot establish the VPN tunnel by themselves.
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