Disable 'Automatically detect settings' in Internet Explorer's proxy settings dialog.

Disable-AutomaticallyDetectSettings.ps1

# Disable 'Automatically detect proxy settings' in Internet Explorer.

# Read connection settings from Internet Explorer. 
$regKeyPath = "HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\" 
$conSet = $(Get-ItemProperty $regKeyPath).DefaultConnectionSettings 
  
# Index into DefaultConnectionSettings where the relevant flag resides. 
$flagIndex = 8 
  
# Bit inside the relevant flag which indicates whether or not to enable automatically detect proxy settings. 
$autoProxyFlag = 8 
  
If ($($conSet[$flagIndex] -band $autoProxyFlag) -eq $autoProxyFlag) { 
    # 'Automatically detect proxy settings' was enabled, adding one disables it. 
    Write-Host "Disabling 'Automatically detect proxy settings'." 
    $mask = -bnot $autoProxyFlag 
        $conSet[$flagIndex] = $conSet[$flagIndex] -band $mask 
    $conSet[4]++ 
    Set-ItemProperty -Path $regKeyPath -Name DefaultConnectionSettings -Value $conSet 
} Else { 
    Write-Host "'Automatically detect proxy settings' was already disabled." 
}