I wanted to update Steam to purchase some games in the annual sale, and unfortunately due to some proxy-related configurations it was forced into offline mode. When the system came back, the error indicated that steam was in offline mode, but had to be in online mode to update, then it quit. Very annoying, since changing to online mode requires you to be in the steam application.

I found the solution, you go to:
/Users/$yourusername/Library/Application Support/Steam/ and locate registry.vdf

The variable you need to set is Registry / HKCU / Software / Valve / Steam / Offline, which you set to "0".

Pretty surprising to see that Steam just ports what seems to be the windows Registry format over for configuration, but it seems to work (mostly :) )

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