How can I resolve iCal desktop application error message after Yosemite upgrade?

After upgrading Yosemite on my MacBook Air, MacBook Pro and iMac, my iCloud calendar generates an error message: "The server is currently unreachable or the connection was blocked."
I am able to create and edit my iCloud calendar events on my iPad, my iPhone, and any browser by signing into iCloud.com.
All other services such as Mail, reminders, keychain, and so on continue to work normally.
Other services like Google's Calendar continue to work seamlessly across all mobile devices, web browsers, and the iCal desktop applications.
I have logged out of iCloud in System Preferences and then logged back, but that did not resolve the issue.
This is concerning since I am unable to add, edit, or delete events in the iCal desktop software on my computers.
Any help welcome!

Found my solution!
When logging back into iCloud in System Preferences, I received an error message that my (iCloud) account could not verify the "identity" of the "p03-caldev.icloud.com" account.
I was required to "trust" an Entrust.net Secure Server Certification Authority certificate to remove the error message.
Everything now synchronizes across iCal on my computers and my mobile devices/icloud.com.

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