Deploy the Proxy PAC using DNS

If the DHCP server does not provide the desired information, DNS is used.

The Web Proxy Auto-Discovery Protocol

If, for example, the network name of the user's computer is pc.department.branch.example.com, the browser will try the following URLs in turn until it finds a proxy configuration file within the domain of the client:

http://wpad.department.branch.example.com/wpad.dat
http://wpad.branch.example.com/wpad.dat
http://wpad.example.com/wpad.dat
http://wpad.com/wpad.dat

As you can see the “wpad” computer name is a specific record.

That’s why, for Microsoft, this record is banned to avoid mistakes.

Add WPAD Record Into Microsoft DNS

On the Microsoft DNS server run a CMD as administrator and type:
dnscmd /info /globalqueryblocklist

If wpad appears in the response, you should run the command:
dnscmd /config /enableglobalqueryblocklist 0
Run the DNS configurator by typing “dnsmgmt.msc”
Add a new Host (A or AAAA)

In the name, type “wpad”
Point the ip address to the Artica server that stores the Proxy PAC service.