Installing the OpenVPN Client Configuration Manually

Performing a manual client installation instead of using the OpenVPN Client Export Package requires additional steps to install the software and settings onto the client devices. Installing the client on other operating systems is left up to the reader.

After installing OpenVPN, copy the certificates to the client and create the client configuration file.

Copy certificates

Three files from the firewall are needed for each client: the CA certificate, the client certificate, and the client key. A fourth file, the TLS key, is only required if the server was configured for TLS authentication.

• Export the CA certificate from System Cert > Manager on the CAs tab, save this as ca.crt
• Export the client certificate and key as described in Local Users, save these as username.crt and username.key

• Copy these files to the OpenVPN config directory on the client
• Copy the TLS key from the server configuration screen If TLS authentication is used on this OpenVPN server. Save this into a new text file called tls.key and include it in the config folder as well.

Create Configuration

After copying the certificates to the client, the OpenVPN client configuration file must be created. This can be done with any plain text file editor such as Notepad on Windows. The following shows the options most frequently used

client dev tun proto udp remote vpn.example.com 1194 ping 10 resolv-retry infinite nobind persist-key persist-tun ca ca.crt cert username.crt key username.key verb 3 comp-lzo tls-auth tls.key 1 auth-user-pass

remote Specifies the host and port of the remote OpenVPN server. An IP address or FQDN can be specified here.

proto Specifies the protocol used by the OpenVPN connection. Change this line to proto tcp if TCP is used on the OpenVPN server.

ca, cert, key Must be modified accordingly for each client to reflect the filenames saved previously.

tls-auth If TLS authentication is not used, the tls-auth line may be omitted.

auth-user-pass If the remote access VPN does not include username and password authentication, omit this line.

Distributing configuration and keys to clients

The easiest way to distribute the keys and OpenVPN configuration to clients is via the OpenVPN Client Export package. If that package is not a viable choice, place the needed files in a ZIP archive or self-extracting archive automatically extracting to C:\Program Files\OpenVPN\config. This must be transmitted securely to the end user, and must never be passed over untrusted networks unencrypted.