Often when my Macbook Pro Retina has been asleep, I get the following upon waking up:

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It is irritating because I get the bouncy iCal icon in my doc and have to dismiss the error message every time. Anyone know how to prevent this?


Several things could cause this, but you could eliminate or reduce the chance by doing any or all of the following:

  1. Turn off all networking before sleeping.
  2. Reduce the refresh time period for that calendar to avoid it refreshing while the system is waking or getting re-connected with an available network.
  3. Quit Calendar before sleeping.
  4. Move the calendar to another hosting site (assuming it's not really the Mac that's causing the http error.)

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