Quartz contains an "update check" feature that connects to a server to check if there is a new version of Quartz available for download. This check runs asynchronously and does not affect startup/initialization time of Quartz, and it fails gracefully if the connection cannot be made. If the check runs, and an update is found, it will be reported as available in the Quartz logs.

You can disable the update check by setting the Quartz property, org.quartz.scheduler.skipUpdateCheck:true, the system property org.terracotta.quartz.skipUpdateCheck=true (which you can set in your system environment or as a -D on the java command line). It is recommended that you disable the update check for production deployments.