pfSense is a free and open-source firewall and router that also features unified threat management, load balancing, multi-WAN, and more. The following paragraphs show you how to add HuntVPN to your pfSense firewall.
PfSense Homepage:

Configure PfSense Step by Step:

1. Adding HuntVPN's Certificate Authority (CA)
2. Import HuntVPN Certificate
3. Adding HuntVPN as an OpenVPN Client

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• Download your connection profile and extract the file ca.crt.
• Open the ca.crt file with a text-editor like notepad.
• Use your browser to log in to the pfSense Web Interface.
• Go to the Certificate Manager by clicking on 'System' and then 'Cert. Manager'.
• In the CA tab click on the Add button.

Add the following fields:

• Descriptive name:HuntVPN CA
• Method:Import an existing certificate authority
• Trust Store:Check Add this Certificate Authority to the Operating System Trust Store
• Certificate data:copy-past the certificate from the ca.crt file.

Click the Save button to add the CA.

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• Extract the files cert.crt, and privat.key from your downloaded connection profile and open them in a text editor.
• Go to the Certificate Manager by clicking on System and then Cert. Manager
• In the Certificates tab click on the Add/Sign button.

Add the following fields:

• Method:Import an existing certificate
• Descriptive name:HuntVPN Certificate
• Certificate Type:X.509 (PEM)
• Certificate data:copy-past the certificate from the cert.crt file.
• Private key data:copy-past the certificate from the private.key file.

Click the Save button to add the Certificate.

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HuntVPN can be configured as a OpenVPN Client in pfSense using the following steps.

• In the top menu, click on VPN and select the OpenVPN option.
• Click on the Clients option in red.
• Press the green "Add button at the bottom.
• Extract the tls.key and vpn.txt file from your downloaded connection profile and open them in a text editor.

Add the following fields:

• Description:HuntVPN
• Server mode:Peer to Peer ( SSL/TLS )
• Device mode:tun - Layer 3 Tunnel Mode
• Interface:any
• Server host or address:use the Host specified in vpn.txt
• Server port:use the Port specified in vpn.txt
• TLS Configuration:Select Use a TLS Key
• Automatically generate a TLS Key:Unselect
• TLS Key:copy-past the certificate from the tls.key file.
• TLS Key Usage Mode:TLS Encryption and Authentication
• Peer Certificate Authority:select the previously imported HuntVPN CA
• Client Certificate:select the previously imported HuntVPN Certificate
• Data Encryption Negotiation:Check Enable Data Encryption Negotiation

Click the Save button to add the OpenVPN Client.

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w: pfSense