Capture with "use automatic configuration script" option in IE

[Maor]

Hi,

We have a Websense proxy on our company and we are using their PAC address under "use automatic configuration script" option in IE (Under LAN settings).

When i open Fiddler it does not capture the traffic when i use this option, it does only when i use the third checkbox "Proxy server" and put a local proxy address inside it.

Is there any way to allow Fiddler capturing traffic with the second option "use automatic configuration script"?

 

Thanks,

Maor

[Eric Lawrence]

When Fiddler starts, it replaces your current proxy settings with its own. It uses the proxy settings that were there before it started as an "upstream" proxy to which it chains. For instance, if you're set to "AutoDetect", Fiddler will replicate the autodetect logic itself after it sets itself as the proxy.

If you (or some other software) attempts to change the proxy settings away from Fiddler as it runs, Fiddler will stop working.

Regards,
Eric Lawrence
Telerik

[Maor]

Thanks Eric,

I'm running Fiddler only after the websense client runs and put his pac file on IE.

i don't understand why Fiddler can't work with the second option under Lan settings on IE. no matter what i put there it doesn't work,

only when i use the third option.

how can i make it work?

[Eric Lawrence]

Fiddler is a proxy; it only sees traffic that is sent to it. If you configure IE to point its proxy settings to some other proxy (your Proxy Configuration Script, what you're calling the "second option"), then the traffic is sent to that proxy, not Fiddler.

To make Fiddler work, configure your proxy Configuration Script. Then start Fiddler, which will reset your proxy settings to point to itself.

If something else comes along and changes the proxy settings out from under Fiddler, you will need to disable that "Something else" to stop it from doing that.

Regards,
Eric Lawrence
Telerik

[Maor]

Eric thanks,

I disabled the Websense client and it started to work.