FortiClient VPN Connection getting stuck at Status: 98% (Solved)

Problem

When connecting to VPN network using FortiClient users occasionally are unable to make the connection as the VPN client seems to be malfunctioning. The connection gets stuck at Status: 98% and they get disconnected. This problem appears to be affecting FortiClient version 5.3.xxx as well 5.4.1.0840 running on Windows 8 and 10 that we are aware of.

It’s s been determined that there is a problem with the Windows operating system WAN miniport driver and not specifically with a Forticlient issue.

[…]