Troubleshooting Tip: FortiClient VPN gets 'failed to connect check your internet and VPN pre-shared key' on Windows 11

[Umer221]

Description	This article describes how to troubleshoot the error 'VPN connection failed. Please check your connection, network connection and pre-shared key then retry your connection. If the problem persists, contact your network administrator for help'.
Scope	FortiClient, Windows 11.
Solution	An example of the error: Go to Realtek PCIe FE / GBE / 2.5G / 5G Ethernet Family Controller Software. Download the Windows 10 Realtek driver: After installing the Windows 10 Realtek driver, reboot and test FortiClient again. The issue arises due to incompatibility between the Windows 11 driver and FortiClient.