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

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Zyxel_USG_User
Zyxel_USG_User Posts: 81  Ally Member
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edited January 3 in Security

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 ?

All Replies

  • Caroll
    Caroll Posts: 19  Freshman Member
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    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

  • Zyxel_USG_User
    Zyxel_USG_User Posts: 81  Ally Member
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    Hi, USG20W-VPN.

  • Caroll
    Caroll Posts: 19  Freshman Member
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    @Zyxel_USG_User have you tried the solution mentioned on that post already? is it ok?

  • Zyxel_USG_User
    Zyxel_USG_User Posts: 81  Ally Member
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    Hi, thanks for the reply. I will try it as soon as I get a MacOS device to test. Thank you.

  • faye83
    faye83 Posts: 7  Freshman Member
    First Comment

    Hello everyone,

    after updating Sequoia 15.4.1 this setting no longer works.

    The vpn doesn't connect anymore. Does anyone know how to solve it ? Thanks for your help

    Regards, Faye

  • Zyxel_USG_User
    Zyxel_USG_User Posts: 81  Ally Member
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    edited June 6

    Finally got to test the IPSec VPN on MacOS and it works.

    Environment:

    Macbook Pro and Max and so on, latest generation, latest MacOS,

    the SecuExtender version for Mac,

    an USG20W-VPN.

    After adding the infos in the IPSec firewall configuration as stated in the infos here in the forum, wow…. the Mac can use the IPSec VPN!

    Just make sure after installing the app, that you download the IPSec configuration from the firewall, via LAN, with a valid IPSec username and password.

    My other configurations like native Windoze IPSec, StrongSwan continued to work as well :)

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