FortiClient under iOS (iPhone + iPad) DNS Server not handed over

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Hello,

our customer's local VPN servers (both domain controllers in the same subnet as FortiGate) will not be handed over to iOS devices.

The latest APP version is installed on the iOS devices. The latest firmware is installed on the FortiGate FG200E (6.2.2 - latest patch).

The problem is:

The DNS servers that have not been passed do not resolve the names in the local customer domain.

The same VPN configuration on the firewall side works with the FortiClient VPN on Windows without any problems.

I think the iOS app has a bug in this regard. The theme can be adjusted with our other customers.

In the case of the VPN client under Windows the traffic is visible, in case of the VPN client under iOS the traffic on the firewall is not visible, the iOS devices try to derive the DNS names over the Internet, because the DNS servers are not handed over to the iOS devices.

Any ideas or workaround?

Thanks and best regards,

Mike