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Forticlient VPN stopped working no macOS Monterey

Forticlient VPN was working normally on macOS Big Sur and after upgrading to Monterey it stopped working. When trying to login it keeps connecting and then the error appears: Connection Error! VPN connection terminated unexpectedly! (Error Code: -121)

MacBook Air 13″, macOS 12.0

Posted on Oct 27, 2021 10:26 AM

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Question marked as Top-ranking reply

Posted on Oct 27, 2021 10:46 AM

Check with the Developers of this Application for an update for Specifically Monterey compatible version.


Just because it worked in Big Sur macOS 11 does not automatically mean it will work in the New Monterey macOS 12

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19 replies

Nov 14, 2021 5:02 PM in response to gui_pear

Unless you're using a true VPN tunnel, such as between you and your employer, school or bank's servers, they are useless from a privacy standpoint.  Read these two articles: Public VPN's are anything but private and Former Malware Distributor Kape Technologies Now Owns ExpressVPN, CyberGhost, Private Internet Access, Zenmate, and a Collection of VPN “Review” Websites


Don't use a public VPN because you think you're protecting your privacy.



Jan 27, 2022 4:19 PM in response to JuanManDon

What I had to do was restore the machine to factory and install a brand new downloaded VPN client from Fortinet's site to get mine working. The problem I had was when the user got a new MAC and I used the migration tool to migrate the users data to the new machine it would break the VPN client. When I did a fresh install it would work. Just not when we used the migration tool. Also make sure and allow the VPN client to give notifications as well as go into the security setting and give it access to the document folder.

Forticlient VPN stopped working no macOS Monterey

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