System time is 20 minutes behind even when ntp is used.

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Issue

There are four Java application servers running in our production environment. They are all pointed to the same switch to sync time, all four have the same ntp.conf with the same permissions.
Time is accurate on two servers however two run 20 minutes behind.

Environment

Red Hat Enterprise Linux 5.7
ntp-4.2.2p1-15.el5_7.1

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