When connecting to an appliance using an SSLVPN tunnel, through Net Extender on a Windows Machine you receive the following error:
This issue seems to occur when the WAN Miniport (IP and PPTP) network devices are deleted, corrupted, or otherwise broken on the End Device.
TIP: You can also install the Mobile Connect Application from a Microsoft Store and connect to the SSLVPN (Mobile Connect supports both MAC and Windows OSs).