NoAddressHook is called when there are no addresses left or
the allocation fails because of too many simultaneous
tries.
NoAddressHook is passed with the following arguments:
- Reference to the current request object
- Reference to the current reply object
- Reference to current authentication result
- Reference to a string variable holding the reason for a
reject
- String variable holding value of pool hint
To change the type of reply, change the third argument from
$main::REJECT to the desired value.