Sun Java System Message Queue 4.3 Administration Guide

Synchronizing System Clocks

Before starting any brokers or clients, it is important to synchronize the clocks on all hosts that will interact with the Message Queue system. Synchronization is particularly crucial if you are using message expiration (time-to-live). Time stamps from clocks that are not synchronized could prevent message expiration from working as expected and prevent the delivery of messages. Synchronization is also crucial for broker clusters.

Configure your systems to run a time synchronization protocol, such as Simple Network Time Protocol (SNTP). Time synchronization is generally supported by the xntpd daemon on Solaris and Linux, and by the W32Time service on Windows. (See your operating system documentation for information about configuring this service.) After the broker is running, avoid setting the system clock backward.