Windows 8 Internet Explorer 11 proxy automation script

internet explorerPROXYwindows-8.1

Similar to this post, I'd like to change my proxy settings using a script. However, it fails. When I am behind the proxy, IE does not connect to the internet. Here I try the first solution from craig:

function FindProxyForURL(url, host) 
{ 
 if (isInNet(myIpAddress(), "myactualip", "myactualsubnetip")) 
  return "PROXY proxyasshowninpicture:portihavetouseforthisproxy_see_picture"; 
 else 
  return "DIRECT"; 
}

This script is saved as proxy.pac in c:\windows and my configuration is* in LAN settings:
No automatically detected settings,
yes, use automatic config script: file://c:/windows/proxy.pac
No proxy server.

So, what am I doing wrong?

—————- update ————–

However, when I set up a proxy in my LAN configurations:

IE -> Internet Options -> Connections -> LAN Settings 
check: Use a proxy Server for your LAN
Address: <a pingable proxy> Port: <portnr>

everything is fine for this environment. Now I try a simpler script like

function FindProxyForURL(url, host)
{
    return "PROXY <pingable proxy>:<portnr>; DIRECT";
}

With a configuration described above** I am not able to get through the proxy.

Best Answer

Finally this page lead me to my solution: 

file://-based proxy scripts are deprecated in IE11.

There are some temporary registry hacks given, but I was not able to get my scripts to work with regedits. Finally I set up a local IIS server 

Windows Start - "Control Panel." - click "Programs" link - "Turn Windows Features On or Off." 
Check the box labeled "Internet Information Services." Click "OK."

and moved my *.pac javascript file with the content

function FindProxyForURL(url, host)
{
    return "PROXY <proxyIP>:<proxyPort>; DIRECT";
}

into inetpub\wwwroot.

Afterwards I checked "Use automatic configuration script" in IE -> Internet Options -> Connections -> LAN Settings. Use the \inetpub\wwwroot\scriptFilename.

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