Internet Explorer 9 stops using PAC File

Hi,
several machines that have Internet Explorer 9 installed suddenly stopped connecting to the internet using a PAC file. Chrome as well as Firefox
work with the PAC file set in IE, setting a static proxy adress in the Proxyserver field in IE works too for all browsers including IE9.
I tried reverting to IE 8 which seems to accept the PAC, after reinstalling IE9 it stops working again, i tried both a local file as well as a PAC
hosted on a web server, to no avail. PAC file is tested on all 3 browsers and works on 99% of the Win 7 computers, so its not a problem with the syntax, im at a loss of idea here.
Path set for the PAC File://C:\Windows\System32\drivers\etc\Proxy.pac
Does someone have an idea how to fix this or some way to troubleshoot this problem any further?
Thanks in advance.

Hi,
Have you considered the scenario described in the KB 2777234? Or you might refer to this link and check if it can give you some hints:
https://community.mcafee.com/thread/52242?tstart=0
NOTE
This
response contains a reference to a third party World Wide Web site. Microsoft is providing this information as a convenience to you.
Microsoft
does not control these sites and has not tested any software or information found on these sites.
If still no clear cause, then I would suggest you use a network monitor to trace the process and find what happened.
Regards
Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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