I know this post is a little on the old side, but i wanted to say thank you for posting this. I knew there was a firewall-like setting somewhere that was blocking this. This same setting was blocking all machines from downloading and installing Blizzards Battle.net and any updates to games within it if it was already installed. The errors were indicating there was no connection to the update servers, yet in a browser i could grab all the files the logs were erroring on. It turns out the battle.net installer, which also runs the updates to all games, uses this function as well. I would like to see this setting somewhat configurable though i.e. allow an exclusion list with src/dest/app etc options.
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