Only OpenVPN-compatible user certificates are shown
If a client is missing from the list it is likely due to a CA mismatch between the OpenVPN server instance and the client certificate, the client certificate does not exist on this firewall, or a user certificate is not associated with a user when local database authentication is enabled.
Clients using OpenSSL 3.0 may not work with older or weaker ciphers and hashes, such as SHA1, including when those were used to sign CA and certificate entries.
OpenVPN 2.4.8+ requires Windows 7 or later
Links to OpenVPN clients for various platforms: