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

2)  In the tcrules file:

    - SAVE and RESTORE generate fatal compilation errors.
    - '|' and '&' are ignored.

    Corrected in 4.6.2.1.

3)  In the mangle file:

    - '|' and '&' are ignored in MARK ACTIONS.

    Corrected in 4.6.2.1.
