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fmlisboajr
fmlisboajr
New Member
February 13, 2026
Question

MacBook Tahoe 26.2 ortinetClient VPN 7.4.3.6667, Unable to connect to VPN because tunnel configurati

  • February 13, 2026
  • 1 reply
  • 866 views

i have macbook pro running MacOs  Tahoe version 26.2 and install FortinetClient VPN 7.4.3.6667, and when try connect i got message "Unable to connect to VPN because tunnel configuration is unsupported." my company use DH Group 21, if i change to lower group the message does not appers, but off course not connect, are a fix to this issue?

1 reply

Toshi_Esumi
SuperUser
Toshi_Esumi
SuperUser
February 13, 2026

I happen to have the same Tahoe 26.2 MacBook air with the same version of FortiClient VPN installed, and also happen to be testing dialup ipsec with 7.4.11 of FortiOS now.
So, I simply changed DH group to 21 to match your description. But it's working fine.

I think something else is not matching between the FGT setting and your FortiClient config. Just contact whoever manages the FGT side and verify everything you configured on the client is correct. By the way, 7.4.9 had a bug with IKEv2 dialup ipsec on SOC4 platform, which was preventing this from working when multiple clients are connected to the same phase1, it must have been fixed with 7.4.10. And it's working fine with 7.4.11 as well.

Toshi

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