Possible error n.2 and solution

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Possible error n.2: see the image below.

Solution: https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/troubleshoot-error-720-when-establishing-a-vpn-connection

Scenario 3 is the important solution: Reinstall WAN Miniport (IP) interface drivers.

Type “Device Manager” in the Windows search bar.

Right-click all the network adapters whose name starts as “WAN Miniport,” and then select Uninstall device. Here are some adapters that you may observe:

WAN Miniport (IP)

WAN Miniport (IPv6)

WAN Miniport (GRE)

WAN Miniport (L2TP)

WAN Miniport (Network Monitor)

WAN Miniport (PPPOE)

WAN Miniport (PPTP)

WAN Miniport (SSTP)

On the Device Manager menu bar, select Action > Scan for hardware changes.

Restart windows.

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