CalendarAgent downloads 25 MB day! Even if Calendar not open...

Question

Hi - I spend part of my time at a remote site that accesses the internet via a shared satellite connection. It's lousy, but it's the only way to get internet access here. It has daily bandwidth caps (100 MB) which are regulary exceeded by the group of connected computers, even if very little email or web surfing occurs.
In trying to find out which of the users is sucking up all the bandwidth, I discovered that CalendarAgent on each MacOSX machine is constantly sucking down around 25 MB per day, even if the Calendar isn't open! Every 60 seconds CalendarAgent connects to google.com on https:443 and sends and receives a large chunk of data.  I took my computer back to the city to do more measurements and found this to be true there as well.
Obviously the connection to google.com is due to using Google calendars to sync multiple Apple calendars with other remote users, both OSX and other systems. But doesn't this bandwidth usage seem like overkill? Why should CalendarAgent use so much bandwidth all day long, even if I don't open my calendar all day?
Any thoughts on a way to reduce this horrible overhead without having to change our calendar sync system (we have a lot of external users who would not be happy if they had to reconfigure a system that finally is working to everyone's satisfaction, apart from the inefficient use of satellite bandwidth...)

Answer 1

Hi Christian
I feel your pain.  You need better advice than this but maybe this will help keep the thread open.  You probably have down everything on HT3085 maintenance but never hurts to do it again.  You said once only AP was open and it crashed but check you loggin Daemons at startup.  Try eliminating the ones you dont need and turn off Carbonite while trying.  And of course try another Library and see if the problem exits.  And use a new login account  (thanks Leonie).   Make sure your read/write permisions have not changed on the Drobo 5d and its in HFS+ formate.  Your images (referenceed) can be on the Drobo directly connected to your imac but not the database of the Lib, it dosent like nas or ___.  You say it happens only in AP when Repairing  an image or it also happens outside of Aperture, that is AP is not open you still crash.  Do you have another monitor attached to the imac when hangs occur.  How much Ram and what percentage of empty HD space do you have.  Stay positive, from what I hear  most poeple run smoothly, so this too can be fixed.  David