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 and optional
    providers listed in the DUPLICATE column.

3)  The BLACKLIST action was inadvertently omitted from Shorewall6 in
    Shorewall 5.1.1.

    Corrected in Shorewall 5.1.4.1.

