IPSec VPN does not work with latest MacOS, restoring a configuration does NOT reinstall the VPN part

Zyxel_USG_User

Hi all, I have seen the instructions posted in the VPN section and followed them to install IPSec VPN on the newest MacBook with newest MacOS. Older MacOS and notebooks worked fine with the IPSec VPN.

Before: IPSec VPN works for Androids and Windows and older MacOS, but does not work with the newest MacBooks with newest MacOS.

Results after following the instructions in the VPN section for MacOS: nothing works anymore, no device can connect anymore.

I said OK, will restore an older firewall configuration where at least all other devices worked fine with IPSec. Wrong, restoring the configuration did not restore all the VPN settings! Even clicking in the configuration menus to revert to older configuration did not help.

I tried many reconfigurations and reboots, to no avail.

Just completely resetting the firewall and afterwards activating a known configuration worked. Just after that, I managed to reconnect the Androids and Windows and older Mac devices. There is something deep which is not set back properly when loading an older working configuration, just to make IPSec VPN work again.

Can you please fix the issues, and give proper instructions how to make current MacOS on newest MacBooks work with Zyxel VPN's ?

Caroll

Hi @Zyxel_USG_User, What is the firewall model that you're using? For macOS 15, the default L2TP/IPSec VPN setup using the Zyxel VPN wizard can indeed work with the following encryption settings:

• Phase 1: 3DES/SHA1/DH2
• Phase 2: 3DES/SHA1/None

For more details, you may refer to the forum thread discussed here:

VPN client-to-site settings for MacOS 15 (Sequoia) — Zyxel Community