Worked like a charm. Thank you dguido.

It works but is there an easier fix? I don't like to do this on all my machines
What causes this issue?

Parameter Incorrect is a problem I have and followed the fix instructions.Still getting the same message and starting to come to the conclusion that there is a corrupt file on the system.Any ideas from any one who has been tormented from this would be greatly appreciated. In the meantime good luck and keep up the brilliant work.Kind regards to you all.

Parameter Incorrect is a problem I have and followed the fix instructions.Still getting the same message and starting to come to the conclusion that there is a corrupt file on the system.Any ideas from any one who has been tormented from this would be greatly appreciated. In the meantime good luck and keep up the brilliant work.Kind regards to you all.

First problem I meet is modem problem. I first click the "reset network" in Setting -> Network and then restart PC, but problem turn to same with you(Parameter Incorrect). Then I tried this solution, after 1st step, the problem still occur. But after 2nd step the problem finally resolved.

It truly does

This is useful to me, thank you.

AWESOME! Just signed up to thank you! This was so struggling as malfunctioning VPN is equivalent to death in China. You are my savior and make my day.

You are a godsend! Thank you so much!

Thanks!

@alexmelSC registered just to say thanks! After spending an hour trying to mirror my desktop to my laptop (which worked fine) and spending a few minutes with IPVanish chat support to no avail, I finally stumbled across this thread and lo and behold... it worked! Big thank you to you. Much appreciated.

Great Thank you :)

Thanks !

Absolute genius!!! Many thanks, finally solved this : )

Thanks from 2020

Thank you so much. I have been on hours trying to get this working. Your post has made me so happy!!!!!!!

Thanks :)

@alexmelSC : You made my day 👍.
One remark: My first try was to only delete the WLAN Miniport drivers that are relevant for me: IKEv2 and PPPOE.
This was not sufficient: After removing all WLAN Miniport drivers both protocols work again.
Thanks again!

Thanks! 🙏

Thanks for your post, "The parameter is incorrect." error had me baffled with Microsoft's AO VPN, I'd tried so many things and I'd got to the stage of almost giving up and rebuilding my computer (Windows 10 20H2 Enterprise). I'd already tried to uninstall and reinstall the IKEv2 WAN Miniport, but seeing your post I also uninstalled IP and IPv6 and hey presto, no reboot, Device and User Tunnels now connecting and back on AO VPN.

Thanks...

Reset Device Manager adaptors

Open Device Manager
Find Network Adapters
Uninstall WAN Miniport drivers (IKEv2, IP, IPv6 etc) <- I only needed to do IKEv2, IP and IPv6.
Click Action > Scan for hardware changes
The adapters you just uninstalled should come back

Did not work for me, unfortunately. :(
But I found another solution in https://serverfault.com/a/965275. So maybe you could add that.

Works well . Thank You

Works perfect. Thanks!!!

For those, who still get error 87 after clearing networking caches, check that Internet Connection Sharing ICS service is running.

It works, thank you so much.

man, you just saved me from a mental health institute

You're still saving people's lifes, man! Step 2 worked for me. Thank you very much!

Thanks, you just saved me a long drive to the office

Still works like a charm!

Thanks, this works for me. I spent 2 hours to find the issue. But I fixed it in 5 minutes by your solution. God bless you.

This helped me as well.. Crazy that this is been a 3 year issue? Thanks for the advice!