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Description:  

Determines whether users can enable/disable LAN connections.

If you enable this setting, the Enable and Disable options for LAN connections are available to users
(including nonadministrators). Users can enable/disable a LAN connection by double-clicking the icon
representing the connection, by right-clicking it, or by using the File menu.

If you disable this setting (and enable the "Enable Network Connections settings for Administrators" setting),
double-clicking the icon has no effect, and the Enable and Disable menu items are disabled for all users
(including administrators).

Important: If the "Enable Network Connections settings for Administrators" is disabled or not configured, this
setting will not apply to administrators on post-Windows 2000 computers.

If you do not configure this setting, only Administrators and Network Configuration Operators can
enable/disable LAN connections.

Note: Administrators can still enable/disable LAN connections from Device Manager when this setting is
disabled.

Supported on: Windows Server 2003, Windows XP, and Windows 2000 operating systems only.
Ability to Enable/Disable a LAN connection
Description Gpedit Regedit CMD Back VBScript PowerShell Script
Gpedit:   

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type gpedit.msc and press Enter
In the Group Policy window please navigate to User Configuration -> Administrative Templates ->
Network -> Network Connections and open Ability to Enable/Disable a LAN connection.
Not Configured -> is the Default state
Enabled -> apply this GPO
Disabled -> this GPO will not be applied

To finish press ok button and close Group Policy window.
Type regedit and press ok
Please confirm User Account Control pop-up
Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Note: This registry key is created by Group Policy when this GPO is Enable. The GPO Default state is Not
Configured -> this registry entry is not present. For Disable this registry entry is not present.

Please navigate to HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Network Connections
and locate NC_LanConnect registry key
Regedit:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
   
Double click on NC_LanConnect and edit the value:

To Enable:
Change the data value with:
NC_LanConnect = 1

To Disable:
Change the data value with:
NC_LanConnect = 0

To finish press ok button and close Registry Editor window

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
Type cmd, right click on cmd icon under the Programs and click on Run as administrator
Please confirm User Account Control pop-up
Please select, right and copy a registry key from below, then right click on command prompt window
, select Paste and press Enter

Enabled:
REG add "HKCU\Software\Policies\Microsoft\Windows\Network Connections" /v NC_LanConnect /t REG_DWORD /d 1 /f

Disabled:
REG add "HKCU\Software\Policies\Microsoft\Windows\Network Connections" /v NC_LanConnect /t REG_DWORD /d 0 /f

Not Configured:
REG DELETE "HKCU\Software\Policies\Microsoft\Windows\Network Connections" /v NC_LanConnect /f

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
CMD:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
VBScript:          

Const HKEY_CURRENT_USER = &H80000001
strComputer = "."
Set oReg=GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & _
strComputer & "\root\default:StdRegProv")

strKeyPath = "Software\Policies\Microsoft\Windows\Network Connections"
oReg.CreateKey HKEY_CURRENT_USER,strKeyPath
strValueName = "NC_LanConnect"
'Enabled
dwValue = 0
'Disabled
'dwValue = 1
oReg.SetDWORDValue HKEY_CURRENT_USER,strKeyPath,strValueName,dwValue
'Not Configured
'oReg.DeleteValue HKEY_CURRENT_USER,strKeyPath,strValueName
   
PowerShell Script :          

Enabled

$RegKey = "HKCU:\Software\Policies\Microsoft\Windows"
If(Test-Path ($RegKey + "\Network Connections"))
{
 $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Network Connections"
  ##Enabled
  New-ItemProperty -path $RegKey -name NC_LanConnect -value 1 -PropertyType DWord -Force
  ##Disabled
  ##New-ItemProperty -path $RegKey -name NC_LanConnect -value 0 -PropertyType DWord -Force
}
else
{
 New-Item -path $RegKey -name "Network Connections"
 $RegKey = "HKCU:\Software\Policies\Microsoft\Windows\Network Connections"
  ##Enabled
  New-ItemProperty -path $RegKey -name NC_LanConnect -value 1 -PropertyType DWord
  ##Disabled
  ##New-ItemProperty -path $RegKey -name NC_LanConnect -value 0 -PropertyType DWord
}

Not Configured\Disabled

$RegKey = "HKCU:\Software\Policies\Microsoft\Windows"
Remove-ItemProperty -Path($RegKey + "\Network Connections") -name NC_LanConnect
If( (Get-Item -Path($RegKey + "\Network Connections")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\Network Connections")).SubKeyCount -eq 0)
{
 Remove-Item -Path($RegKey + "\Network Connections")
}
   
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Result:

Need test pictures.
Verify code.
Result