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This could indicate a network or DNS problem. Has something recently changed in the deployment environment?
Other things to check:
Any errors in the other logs? (admin log, watcher log, etc.)
Are all Calendar processes running?
Has anything crashed and/or left a core file?
Have you tried stopping and restarting the server?
See the following documentation for additional troubleshooting and information on what data to gather in the event you need to open a Support Request:
Calendar Server 6.3 Administration Guide - Chapter 22 Troubleshooting Calendar Server 6.3 Software
Gathering Debug Data for Sun Java System Calendar Server
Thank you, Deb. I'm sorry, I should have provided more information. Anyway your answer helped me out. Because of the "GetHostByName failed" I thought it couldn't resolver the calendar DNS name, but it was in /etc/hosts. I've seen in watcher.log that the DNS name it couldn't resolve was the mail server one. I fixed it, restarted Calendar services and now it's working. :)