If you are getting this error, just follow the steps below to fix it, and then retry
Right-Click on the monitor or Wi-Fi icon on the bottom right-hand corner. Then Click on “Open Network and Sharing Center”
Click on “Change adapter settings” .
Right click on the VPN connection and go to “Properties”.
Go to “Security” tab. Here select “Allow these protocols” and check the top 3 boxes.
- Unencrypted password
- "Challenge Handshake Authentication Protocol (CHAP)" and deselect all others.
- Microsoft CHAP version 2