Hello,
Today I noticed that I had an iPhoto update in the app store. However, when I tried to do the update, it said I needed to first update to OS/X version 10.8.3. However, when I did the apple menu -> Software update, I got a "nsurlerrordomain error -1012" error message.
Turning web shield off resolved the problem and I am able to see the software update.
My exclusions for web shield only contain client.dropbox.com (https). Should there be apple servers there?
Thanks,
-M