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Internet -> Lan Settings -> Pac File

Answered Internet -> Lan Settings -> Pac File

  • Thursday, January 03, 2013 6:41 PM
     
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    I am trying to configure a proxy.pac file for testing. I've  boiled it down to the most simple config and it still doesn't work.

    I am using a non domain-member WMWare Fusion VM connected with one active network connection bridge to a wired nic.

    Windows8/IE10

    I created a local share on the machine called: \\testvm\proxy and place my proxy.pac file in there.

    The pac file contains just this:

    function FindProxyForURL(url, host) {
 
if ( url == "www.google.com" ) {
         return "PROXY 10.10.10.10";
}
else {
	return  "DIRECT";
}

}

    The 10.10.10.10 machine does not exist.

    I registered the pac file in IE using these settings:

    [Unticked] Automatically detect settings

    [Ticked] Use automatic configuration script

    Address: \\testvm\proxy\proxy.pac

    [Unticked] Use a proxy server for your LAN

    I would expect IE to time out when I try to access www.google.com, but succeed for www.bing.com

    However both urls work.

    What have I done wrong?

     

All Replies

  • Thursday, January 03, 2013 8:55 PM
     
     
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    I created a local share on the machine called: \\testvm\proxy and place my proxy.pac file in there.

    Address: \\testvm\proxy\proxy.pac

    the syntax needs to be a little different. You're using UNC and it needs to be compliant with URI/URL.

    if the PAC file is hosted on the local machine itself, you need something like this:

    file:////testvm/proxy/proxy.pac

    check here: http://techblog.mirabito.net.au/?tag=pac-file

    Don
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  • Thursday, January 03, 2013 10:02 PM
     
     
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    Thanks.

    I have it set up as described (I had thought the four /'s were a typo).

    I am still able to access the pages I should not be able to access. If there is no proxy defined at 10.10.10.10 is does not just fail to DIRECT does it?

    IS the fact that I have not specified a port a problem?

     
  • Thursday, January 03, 2013 11:15 PM
     
     
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    some more references for you, John LoVerso's no-ads.pac looks like it might be what you want to read up on..

    http://www.proxypacfiles.com/proxypac/index.php?option=com_weblinks&view=category&id=34%3Aother-pac-file-guides-and-documentation&Itemid=98

    http://www.schooner.com/~loverso/no-ads/

    Don
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  • Friday, January 04, 2013 9:11 PM
     
     
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    Thanks.

    As far as I can tell those sites (& most things I have found on the internets) help me write and validate the pac file, my pac file is super-simple so I know it 'works', the problem is that Windows/IE10 do not appear to use the file and I don't know how to confirm or log this?

     
  • Friday, January 04, 2013 10:55 PM
     
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    you should be able to use wireshark or netmon or fiddler to examine the outbound packets/requests/responses.
    but it may be that the TCP/IP stack is returning something like "no route to host" for the 10.10.10.10 destination.
    John LoVerso's guide talks a little bit more about the browser settings needed to get blackholeproxyserver working: http://www.schooner.com/~loverso/no-ads/#howwork

    I've dabbled with PAC files a long time ago, but not with blackholeproxyserver setups.
    It seems you may need a little bit more than just the PAC file itself.
    And, things may have changed (just a guess) under Win8/IE10 ?

    Don
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    • Proposed As Answer by Himanshu12221 Saturday, January 05, 2013 12:51 AM
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  • Saturday, January 05, 2013 12:17 AM
     
     
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    I must be doing something wrong -- no idea what.

    (incidentally is this the most useless KB ever: http://support.microsoft.com/kb/278356)

    I have reverted to an XP/IE8 VM.

    First I tried: IE Properties -> Connections -> LAN Settings to have
    - [Unticked] Automatically detect settings
    - [Unticked] Use automatic configuration script
    - [Ticked] Use a proxy server for your LAN
    - Address: 192.168.8.141
    - Port: 8888

    I have the other Win8 machine running on 192.168.8.141. On this machine fiddler is running, listening on port 8888 so it really works as a proxy.
    When I browse anywhere on the XP machine I see the traffic pass though the Fiddler proxy on the Win8 machine.
    Great!


    So now to test t with the pac.


    I have configured the IE Properties -> Connections -> LAN Settings to have:
    - [Unticked] Automatically detect settings
    - [Ticked] Use automatic configuration script
    - Address: file:////c:/pac/proxy.pac
    - [Unticked] Use a proxy server for your LAN

    The pac file now contains:
    --
    function FindProxyForURL(url, host)
    {
        return "PROXY 192.168.8.141:8888";
    }
    --

    I would expect this to behave in the same way as the original config, but, No, the traffic goes direct to the internet, skipping the proxy config.



     
  • Saturday, January 05, 2013 5:23 AM
     
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    I have configured the IE Properties -> Connections -> LAN Settings to have:
    - [Unticked] Automatically detect settings
    - [Ticked] Use automatic configuration script
    - Address: file:////c:/pac/proxy.pac
    - [Unticked] Use a proxy server for your LAN

    maybe try:
    file://c:/pac/proxy.pac

    I've never been totally %100 on the "correct" syntax, when it's a local file rather than via UNC

    Don
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    This helps the community, keeps the forums tidy, and recognises useful contributions. Thanks!)

    • Marked As Answer by dmw-asdfghjkl Monday, January 07, 2013 6:22 PM
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  • Monday, January 07, 2013 6:24 PM
     
     
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    I have configured the IE Properties -> Connections -> LAN Settings to have:
    - [Unticked] Automatically detect settings
    - [Ticked] Use automatic configuration script
    - Address: file:////c:/pac/proxy.pac
    - [Unticked] Use a proxy server for your LAN

    maybe try:
    file://c:/pac/proxy.pac

    I've never been totally %100 on the "correct" syntax, when it's a local file rather than via UNC

    Don
    (Please take a moment to "Vote as Helpful" and/or "Mark as Answer", where applicable.
    This helps the community, keeps the forums tidy, and recognises useful contributions. Thanks!)

    Now you can be 100% -- you need just two slashes.

    Combination of the setup above and the super-simple pac file is working for me on my XP machine - it will do.

    Thanks