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Just checked. Hosts was not Read Only, but the folders in the location are. Changing this and trying again.
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Nope. Still not working. Oh well. The manual method still works just...

I'm having trouble using the proxy configuration settings. It is not able to access 'hosts' and fails as soon as it tries to do it.

http://pastebin.com/2BpYkVJD

Edit: I went with the manual...