We've been using Fortigate and FortiClient managed by EMS for many years now. The Fortigate is currently on 6.0.10 and the FortiClients vary from 6.0.5 to 6.0.10. We have several hundred VPN users and most work without issues.
We've had a couple of users now report they cannot access internal resources. When we check the client, we find they can reach the host by IP, but it appears Windows isn't using the internal DNS server to resolve the host name. If we open a command prompt and type NSLookup, it connects to the internal DNS server we have defined in the SSLVPN settings. We confirmed the DNS suffix is also configured in the Fortigate SSLVPN configuration.
The large majority of clients work, but it seems the list of users having issues resolving internal hosts by name is slowly growing. I'm not sure if a Windows update has suddenly caused this to start, but I am looking to the community for some suggestions?