> him that the directory was empty, even though the 450 response does not
> appear to be part of the RFC standards for FTP. (Unless I'm mistaken.)


You're mistaken. As per RFC959:

http://www.faqs.org/rfcs/rfc959.html

Section 4.2.1, the 450 response code indicates:

450 Requested file action not taken. File unavailable (e.g., file busy).

Section 5.4 explicitly indicates that the 450 response code is legal for
both the LIST and NLST commands:

LIST
125, 150
226, 250
425, 426, 451
450
500, 501, 502, 421, 530

NLST
125, 150
226, 250
425, 426, 451
450
500, 501, 502, 421, 530

Neither RFC959, nor any other FTP-related RFC, mandates which response
codes are to be used for which specific conditions for directory listings;
that is intentionally left to the server implementors.

TJ

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

There is a pleasure in the pathless woods,
There is a rapture on the lonely shore,
There is society, where none intrudes,
By the deep sea and music in its roar:
I love not man the less, but Nature more,
From these our interviews, in which I steal
From all I may be, or have been before,
To mingle with the Universe, and feel
What I can ne'er express, yet cannot all conceal.

-Lord Byron

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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