Enable proxy mode in the IP security settings in IIS.

Enable-IpSecurityProxyMode.ps1

function Enable-IpSecurityProxyMode($websiteName) {
    Add-Type -Path "$env:SystemRoot\System32\inetsrv\Microsoft.Web.Administration.dll"
    $manager = New-Object Microsoft.Web.Administration.ServerManager
    $config = $manager.GetApplicationHostConfiguration();
    $cpSecConfig = $config.GetSection("system.webServer/security/ipSecurity", $websiteName)

    $cpSecConfig.SetAttributeValue("enableProxyMode",$true)
        
    $manager.CommitChanges();
    $manager.Dispose()
}