topic Re: [Important] Issues with Harmony Endpoint MacOS v26.3 in Endpoint

[Important] Issues with Harmony Endpoint MacOS v26.3

Danielle_Allon — Thu, 12 Feb 2026 14:45:08 GMT

Hi all,

Please note that we are currently experiencing issues with Harmony Endpoint MacOS version 26.3.

We recommend not updating to this version until further notice.

We are currently investigating the issue; we will share more details later today.

More information can be found in this SK: https://supportcenter.checkpoint.com/supportcenter/portal?solutionid=sk184676

Feel free to reach out to us if you have any concerns.

Regards,

Danielle Allon | Product Manager

Check Point Software Technologies

Email: danielleal@checkpoint.com

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

ram_avala — Thu, 12 Feb 2026 12:24:32 GMT

My M1 MacBook air went into restart loop post the update🥲

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

the_rock — Thu, 12 Feb 2026 12:26:16 GMT

I was about to open TAC case for it for a customer. Any idea if one can roll back?

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

_Val_ — Thu, 12 Feb 2026 12:29:34 GMT

Time Machine backup

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

Doron_Zuckerman — Thu, 12 Feb 2026 12:32:56 GMT

We are working on creating such steps and will share them ASAP.

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

the_rock — Thu, 12 Feb 2026 12:54:51 GMT

Yea, thats true...I have macbook air at home, but its a bit older model, never really tried that method.

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

the_rock — Thu, 12 Feb 2026 12:55:08 GMT

Sounds good, thanks!

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

barthnim — Thu, 12 Feb 2026 13:18:31 GMT

Hi

Have the same problem here. A login reboot loop after upgrade to macOS 26.3 running EPS 89.20 klient.

Deleted the folder "Library/Application Support/Checkpoint/Endpoint Security" for EPS in the terminal in "safe mode". Then we can login to the OS. But, we are not able to reinstall the package 89.20, installation fails after that.

You might also have to remove the network filter from EPS in macOS to get networking working.

Cheers
Morten

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

Doron_Zuckerman — Sun, 15 Feb 2026 13:40:31 GMT

E89.21 for macOS was released.

Please follow: https://support.checkpoint.com/results/sk/sk184676

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

the_rock — Sun, 15 Feb 2026 14:06:48 GMT

Excellent news!

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

Evert_Kooter — Wed, 18 Feb 2026 08:28:24 GMT

The fix works, thank you.

Unfortunately, the update was already downloaded and installed on some Macbooks so we had to fix those. The steps described in de SK article are clear.

I was wondering why this happened. Didn't Check Point test the beta version of 26.3? Or was this caused by a last minute change to the MacOS?

We encourage our users to keep their devices up-to-date especially with security updates. So we don't like to block or postpone installation of minor versions of the OS. Is that something we have to do in the future?

Kind regards,

Evert.

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

TomJung2025 — Sun, 01 Mar 2026 08:49:48 GMT

Apple Configurator and reinstalling IPSW file needed (to make sure, firmware is downgraded too)
Thx _Val_

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

TomJung2025 — Sun, 01 Mar 2026 08:50:37 GMT

p.s. actually previous post was a question to _VAL_. apologies

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

TomJung2025 — Sun, 01 Mar 2026 11:03:50 GMT

did you successfully roll back to 26.2? if yes: how in detail?

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

_Val_ — Sun, 01 Mar 2026 11:16:51 GMT

I believe the change in the network module was introduced in the GA OS version, but not in beta. This is what I heard, and it is also affecting other vendors, not just Check Point. Apple apparently sneaked somethign that was not tested.

Re: [Important] Issues with Harmony Endpoint MacOS v26.3

_Val_ — Sun, 01 Mar 2026 11:18:40 GMT

My unerstanding is, all you need to have is outlined in the SK. If you still need assistance, please open a TAC case: https://help.checkpoint.com