IPSec on macOS Mojave 10.14.6

First, download the CA.crt from IRCNow. Opening the file will open up Keychain Access on a Mac:

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At the bottom-left pane of Keychain Access, you will see 'All Items' underneath 'Category'. Select 'All Items'. Then, on the bottom-right pane, search for vpn.ircnow.org. When you select it, Keychain Access should say "vpn.ircnow.org" certificate is not trusted.

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Double-tap the certificate. You should see 'Trust'. Tap the triangle and then, where it says "When using this certificate:", select "Always Trust". Close the window and type in the administrator password to save changes.

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Next, open the System Preferences app and then click on Network. At the bottom-left side of the window, there will be a + button. Tap that, then select VPN for the Interface. The VPN Type should be IKEv2. The Service Name should be vpn.ircnow.org.

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For Server Address, put vpn.ircnow.org . For Remote ID, put vpn.ircnow.org . Please put your username for your unique Local ID.

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Click on Authentication settings and enter your username and password.

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Click on Connect. If you see the circle turn green, the VPN is working. Use a search engine to search 'What's my ip address' and visit a site. If the IP address is not yours, then the VPN is working. Congrats!

For legacy users, the old cert is available here: CA.crt