Calendar on Macbook Pro won't synch with iCloud

Calendar on my Macbook Pro won't synch with the Calendar on iCloud. I tried a number of times to delete Calendar from iCloud in System Preferences then restart the laptop. I also switched the 'enable' function on and off in Calendar Preferences. I restarted after every attempt and also refreshed. It looks as if it's updating but then nothing happens and the triangular, exclamation mark appears, grayed out, next to the iCloud icon in Calendar. I saw an answer in the Apple Support troubleshooting section regarding this about the server having to access port 80 or 443. Could this be the problem and if so then how would I make any port accessible to the relevant server? I'm not having this problem with my other devices or computer.

Hello Wateru,
Thank you for providing the details of the calendar issue you are experiencing with your MacBook Pro.  You have taken some really good troubleshooting steps already.  I recommend continuing with the steps in the sections titled "General troubleshooting" and  "Troubleshooting on OS X" in the following article:
iCloud: Troubleshooting iCloud Calendar
http://support.apple.com/kb/ts3999
Thank you for using Apple Support Communities.
Best,
Sheila M.

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