Proxy Refresh

README.md

• in directory C:\Program Files\WindowsPowerShell
• create new directory Refresh-Proxy (same name as module)
• put Refresh-Proxy.psm1 module
• verify functionality in PowerShell using command Refresh-Proxy
• create scheduled task
  • command powershell
  • argument Refresh-Proxy

Refresh-Proxy.psm1

# @see https://github.com/majkinetor/posh/blob/master/MM_Network/Update-Proxy.ps1
# @modified Oliver Hader <h4ck671234@h4ck3r31.net>
# @date 2021-06-10

#requires -version 2.0

function Refresh-Proxy() {
    [CmdletBinding()]
    param(
        # Show Internet Options GUI
        [switch] $ShowGUI
    )

    if ((refresh-system)) {
        Write-Host -Foreground Green "Refreshed settings..."
    } else {
        Write-Host -Foreground Red "Could not refresh settings!"
    }

    $key  = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings"
    $r = gp $key

    Write-Host
    Write-Host "Reading proxy data from the registry"
    $proxy=@{
        Server = if ($r.ProxyServer) { $r.ProxyServer } else { "none" }
        AutoConfigURL = if ($r.AutoConfigURL) { $r.AutoConfigURL } else { "none" }
    }

    New-Object PSCustomObject -Property $proxy
    if ($ShowGUI) { start control "inetcpl.cpl,,4" }
}

# The registry changes aren't seen until system is notified about it.
# Without this function you need to open Internet Settings window for changes to take effect. See http://goo.gl/OIQ4W4
function refresh-system() {
    $signature = @'
[DllImport("wininet.dll", SetLastError = true, CharSet=CharSet.Auto)]
public static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int dwBufferLength);
'@

    $INTERNET_OPTION_SETTINGS_CHANGED   = 39
    $INTERNET_OPTION_REFRESH            = 37
    $type = Add-Type -MemberDefinition $signature -Name wininet -Namespace pinvoke -PassThru
    $a = $type::InternetSetOption(0, $INTERNET_OPTION_SETTINGS_CHANGED, 0, 0)
    $b = $type::InternetSetOption(0, $INTERNET_OPTION_REFRESH, 0, 0)
    return $a -and $b
}

Export-ModuleMember -Function Refresh-Proxy