Recieving Error Code 60 connecting iCal to OS X Server
This may help:


Open iCal on your client computer > Preferences
Go to the Accounts tab
Go to Server Settings tab
Make sure there is a port number entered. It should match the port number being used by the iCal server. Originally, this setting was on "Auto" and it worked fine. The "Auto" option no longer works. Also, be sure to check "Use SSL" if you are doing so. (In my setup, I have it on port 8443, with SSL on.) 


Also make sure everything has been updated.