We use WPAD internally for our users/visitors to be able to automatically detect the proxy settings, but unfortunately Firefox does not always play well with Microsoft telling it what to do…to get to the internet.

Step 0: Check whether you have proxy auto detection enabled on your Firefox. Open up Firefox, go to Tools -> Options:

And you will see:

Step 1: Click on Advanced -> Network -> Setttings

And you will see:

Step 2: By default, the No Proxy option should be selected. Since we want Firefox to automatically detect the proxy settings, we select the second option: “Auto-detect proxy settings for this network“, then click on the OK button at the bottom of the window:

Click on the OK button again to close the Options window:

Step 3: Now in the address bar, type in “about:config” and you will see:

Step 4: In the Filter section, type in “dns“, and you will see:

The “network.dns.disableIPv6” is set to false by default!  This preference affects Firefox’s ability to detect proxy settings in Vista…so we need to change itfrom false (default value) to true in order for Firefox to detect the proxy settings.  To change the value, just double click on the “network.dns.disableIPv6“, and the value will be changed to “true“.  If you look closely, you can see that the Status will also be changed to user set as well, this is because we have changed the default value to something else.  With this in mind, you can feel safe to play around with the preferences in Firefox, and if think you’ve done something wrong, you can always reset the value to the default one. (just right click on the preference and click on Reset):

Step 5: Make sure the value for “network.dns.disableIPv6” is set to true and you are connected to the student network (you can test the network using Internet Explorer), now try to use Firefox to surf the web…the proxy settings should be detected automatically without even need to restart Firefox!  Isn’t that great ☺

Reference:
http://davidtse916.wordpress.com/2008/07/05/university-of-otago-firefoxs-proxy-auto-detection-problem-in-vista/

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