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.
Make Sure the PC has an Internet connection and Windows Server is up to date. Update the PC in case of any pending updates.
Go to Services and find Remote Access Auto Connection Manager and Remote Access Connection Manager Services and start them manually.
Reboot the PC and try connecting again.
Uninstall the existing NetExtender Client, delete the C:\Program Files (x86)\SonicWall folder and its contents, and Update the WAN Miniport Drivers.
To update the WanMiniport Drivers Go to Device manager | Network adapter | Update WAN Miniport IP and PPTP Drive. Re-Install the latest version of the NetExtender Client from www.mysonicwall.com and test.
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).