Cron file names are changed in Sun Java System Web Server 6.1. The Web Server 6.0 file ns-cron.conf, is called schedulerd.conf in Sun Java System Web Server 6.1, and the version 6.0 file cron.conf is now called scheduler.conf. These are located in the https-admserv/config/ directory.
Cron settings from the previous version of your Web server are not migrated to Sun Java System Web Server 6.1during migration. If you need to preserve these, copy the cron settings for the migrated instance to the cron files.