It's all about your luck, because you cannot control the Apple Server traffic issue. We all just fall prey to it ... So shorten the long story ...
Restarting may work, but everything, as in my case, I tried to restart XCODE, SYSTEM, ROUTER and anything else, only the error name changed from "Network connection was lost" to "Request timed out" and Vice Versa ..!
Again, I googled for this error some other solution that I found, so I thought it might help further searchers.
Here Xcode 5 hangs with a timeout error when checking / unloading a "ready to download" application
PS: Only perseverance can help you this way. Save redialing .. And WAIT and WATCH: P
mavericks Feb 14 '14 at 5:06 2014-02-14 05:06
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