OpenVPN is an open-source VPN which is capable of traversing network address translators (NATs) and firewalls since it uses a custom security protocol that utilizes SSL/TLS for key exchanges. The certificate is one of the client authentication methods that OpenVPN supports. With a Certificate Authority (CA) to sign the certificate, the server can use a different certificate for each client in a multi client-server topology.
In this article, we will use XCA, a free Certificate Authority (CA) software, to generate and manage the server and client certificate that required for OpenVPN configuration.
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