VPN Username & Password Incorrect ?
https://www.lifeonnetwork.com/windows/vpn-connection-issue-in-windows-10/
VPN Connection issue in Windows 10
Error Can’t connect to VPN
Getting error while configuring VPN connection in Windows 10
The remote connection was denied because the user name and password combination you provided is not recognized or the selected authentication protocol is not permitted on the remote access server.
Solution Connecting to VPN server configured in Windows server 2003 was not an issue till Windows 8.1. Now connecting from Windows 10 client to the VPN server configured in Windows 2003 server is showing error.
” The remote connection was denied because the user name and password combination you provided is not recognized, or the selected authentication protocol is not permitted on the remote access server”.
After some research I found issue with the CHAP and MS-CHAP V2 is used in VPN Server configured in Windows Server 2003 and creating a new VPN connection from Windows 10 its not using CHAP and MS-CHAP V2 protocol by default.
Here is the some steps to create a new VPN connection from Windows 10 client connecting to VPN server configured in Windows Server 2003.
Step 1 – Click on Start – Go to Setting
Step – 2 – Click on Network and Internet
Step – 3 – Select VPN from the left menu and Add a connection, fill out the details like VPN Provider – Windows (built-in) put your user credential, server name and address, Keep VPN type as Automatic.
Step – 4 – Select the new VPN connection created and click on Internet Option below the page as per the image
Step – 5 – Go to Internet Properties page, select the VPN connection click on settings
Step – 6 – From the VPN setting click on properties
Step – 7 – From the VPN Properties setting Type of VPN should be Automatic then select “Allow these protocols .. MS-CHAP V2
Step – 8 – Now you can connect from Windows 10 client to VPN Server configured In Windows Server 2003.