|This article describes how to troubleshoot an issue where internet connection is lost after connecting to SSL VPN via FortiClient.
|FortiOS, FortiGate, FortiClient.
Some users encounter an issue where, when SSL VPN connections are established via FortiClient, the internet connection disconnects.
Note: If it is necessary to access the company’s servers, it will be necessary to add a specific route to them.
This usually happens when not using split tunneling on the VPN. Without split tunneling, all traffic will be routed through the VPN because establishing the VPN in this case overwrites the default route.
This means that ALL traffic that does not match any other route on the client will use the new default route and hit the opposite end of the VPN. If there is no policy that allows VPN clients to reach the internet, internet connectivity will no longer be available on the PC.
To resolve this, either create a policy or enable split tunneling.
It will then be necessary to delete the default route and set a new one (which gateway can be looked up in the routing table when the VPN is not established). Additionally, set a route to the company subnet over the VPN.
Deleting the default route (and setting a new one) in Windows 10 may require administrator privileges.