Log in as an administrator with permission to change the configuration.
Stop Calendar Server services by issuing the stop-cal command.
At a command line, change to the directory where the ics.conf is located:
cd /etc/opt/SUNWics5/config
Specify read-only mode for the calendar, by setting the parameter as follows:
caldb.berkeleydb.readonly=”yes”
Restart Calendar Server by issuing the start-cal command.
cal-svr-base/SUNWics5/cal/sbin/start-cal
You must restart the services in order for the ics.conf changes to take effect.