1)  On systems running Upstart, shorewall-init cannot reliably secure
    the firewall before interfaces are brought up.

2)  The 'enable', 'reenable' and 'disable' commands do not work
    correctly in configurations with USE_DEFAULT_RT=No.

3)  Two defects have been discovered in the implementation of new
    TRACK_RULES=File feature. Both manifest themselves as a compiler
    assertion failure and occur regardless of the setting of
    TRACK_RULES. Conditions which expose the defects are:

    a) Entries in the ecn file.
    b) The allowBcast action is invoked with a log level specified.

    Both are corrected in Shorewall 5.0.5.1.