Proxy autodiscovery does not work

[flaurijssens]

I'm trying to configure proxy autodiscovery but it does not appear to be working.

The proxy server (IAS 2000) is at our ISP, which is accessible directly from our LAN/WAN through a firewall. They have configured an autoconfiguration script for us, which is working fine when I configure it manually.

I have configured a wpad alias in DNS, and configured DHCP option 252.

I can understand the DNS route does not work, because the script is only accessible on a non-standard port. But DHCP is configured correctly (

http://wpad:8080/wpad.dat).

Why doesn't that work?

 

[mefistofele]

I'm having troubles with autoscovery too.
I've configured DHCP option 252 and DNS, but when I look at the log to check requests, I see that the client asks for

http://server:80/Wpad.dat

instead of

http://server:80/wpad.dat,

so requests are not fulfilled and autodiscovery doesn't work.
I know I can use a policy or a script to set those options, but I'd like to know why it doesn't work.