If your system was not registered on the Red Hat Network, the
rhnsd post-uninstall script,
postun, would fail when attempting to upgrade from Red Hat Enterprise Linux 5.3 to Red Hat Enterprise Linux 5.4. As a result, the rhnsd update would fail:
# rpm -Uhv rhnsd-4.7.0-4.el5.i386.rpm
warning: rhnsd-4.7.0-4.el5.i386.rpm: Hea...
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