A bit of a long shot but:
Could also be in roaming user profiles?
(HKCU\Software\Microsoft\Windows\Current Version\Internet Settings)
Assuming your PC's are built before they're joined to the domain then
it won't be an IE install (after being IEAK'd).
On 19 Apr 2004 10:24:48 -0700,
(E-Mail Removed) (Matt Hickman) wrote:
>"Damon" <(E-Mail Removed)> wrote in message news:<OwOg#(E-Mail Removed)>...
>> Hi all
>>
>> When a new computer joins the domain it is picking up a proxy setting
>> automatically. I have checked in group policy and there is nothing set
>> there.
>
>Have you checked IE for "automatically detect settings" being checked
>in Tools -> Internet Options -> connections -> LAN Settings?