Change ServerAddress of VPN connection - windows

Question

I have a point-to-site VPN connection configured on 30+ client machines and I just had to change the VPN gateway's address. Of course, that means I have to reconfigure all of the client machines. Rather than do it manually, I was hoping I could create some kind of program or script that I could run which would update things automatically. The only thing I need to change is the server address, everything else should stay the same.
I came across these PowerShell commands Get-VpnConnection and Set-VpnConnection. I can successfully retreive the created VPN connection using this command:
Get-VpnConnection MyConnectionName -AllUserConnection
So I tried using the Set variant:
Set-VpnConnection -Name MyConnectionName -ServerAddress NewServerAddress -AllUserConnection
But this simply returns and does nothing. No error, no effect. Checking the server address with rasphone shows that the old address is still being used.
I can also do this:
$connection = Get-VpnConnection MyConnectionName -AllUserConnection
$connection.ServerName = NewServerAddress
This also doesn't do anything, since I'm pretty sure I'm just updating a variable and not "committing" it.
So how can I update the server address? It doesn't even have to be PowerShell, that was just the best option I could find.

Answer 1

I ended up writing a .NET application using DotRas.
If anyone's interested, here's the code:
Public Const EntryName As String = "VPNEntryNAme"
Public Const NewAddress As String = "NewVPNAddress"
Private Sub B_Update_Click(sender As Object, e As EventArgs) Handles B_Update.Click
Using pbk As New RasPhoneBook()
pbk.Open(RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers))
Dim VPN = pbk.Entries.Where(Function(Entry) Entry.Name = EntryName).FirstOrDefault
If VPN Is Nothing Then
MsgBox("VPN not found!", MsgBoxStyle.Critical)
Exit Sub
End If
VPN.PhoneNumber = NewAddress
VPN.Update()
End Using
Dim cn = RasConnection.GetActiveConnections.Where(Function(c) c.EntryName = EntryName).FirstOrDefault
If cn IsNot Nothing Then
cn.HangUp()
End If
MsgBox("The VPN has now been successfully updated")
End Sub

Answer 2

On my side, everything worked fine when I use
Set-VpnConnection -Name MyConnectionName -ServerAddress = "x.x.x.x"
Maybe you can try to remove the old one and a new one
$Connection = Get-VpnConnection -Name MyConnectionName
Remove-VpnConnection -Name MyConnectionName -Force
$Connection.ServerAddress = "x.x.x.x"
$Connection | Add-VpnConnection