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I would like to enable/disable the Internet proxy settings with a powershell script.

cd HKCU:\"Software\Microsoft\Windows\CurrentVersion\Internet Settings"

$a = Read-Host "Enable proxy? (y/n)"

if ($a -eq "y")
{
  set-itemproperty . ProxyEnable 1
  Write-Host "Enabled"
}
else
{
  set-itemproperty . ProxyEnable 0
  Write-Host "Disabled"
}

This updates the registry but how do I tell applications that the settings have changed?

E.g. Chrome will not use the new settings until I go into the Internet Options/Connections dialog and press OK.

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I know this is a long-time later, but this may be a simpler way to do it; a one-liner that toggles the value on or off:

set-itemproperty 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings'  -name ProxyEnable -value (-not ([bool](get-itemproperty 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings'  -name ProxyEnable).proxyenable))
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up vote 0 down vote accepted

Finally found a solution here:

http://huddledmasses.org/setting-windows-internet-connection-proxy-from-c/

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