SSLVPN iOS Stuck connecting

[Middel94]

Hello!
Since September 16, 2025, several customers with Fortigate 40F have been experiencing problems with SSL VPN in tunnel mode on mobile devices. The problems occur on iOS devices.
According to the Fortigate dashboard, the client is authenticated, connected, and has received an IP address. The Forticlient VPN app continuously displays “Connecting.” After several minutes, the process then aborts.

Customer uses Let's encrypt certificate 

ACME details:
Status: The certificate for the managed domain has been renewed successfully and can be used (valid since Tue, 19 Aug 2025 10:17:20 GMT).
Staging status: Nothing in staging

Issuer: C = US, O = Let's Encrypt, CN = R11

FortiOS: 7.4.8

Forticlient iOS App Version 7.4.8

iOS 18.6.2

The bug with ID 1164811 occurs for the customer.

Fortigate was updated from 7.2.11 to 7.4.8 two months ago.

Any help would be appreciated.

[Anthony_E]

Hello,

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Thanks,

[tbarua]

Dear Middel94,
If the user appears as connected in FortiGate, do they have the required access?
If yes, the issue may be with the FortiClient GUI application.

[Sheikh]

Hello @Middel94 ,

Is it happening with a this FCT client ? Have you tried with differnet FortiClient version ?

regards,

Sheikh