RFC 959, "File Transfer Protocol", October 1985

Note: This RFC has been updated by RFC 2228, RFC 2640, RFC 2773, RFC 3659, RFC 5797, RFC 7151

Errata ID: 8726
Status: Reported
Type: Technical
Publication Format(s) : TEXT
Reported By: Gordon Steemson
Date Reported: 2026-01-31

Section Appendix II says:

         CWD /usr/dm
         200 directory changed to /usr/dm
         MKD pathname
         521-"/usr/dm/pathname" directory already exists;
         521 taking no action.

It should say:

         CWD /usr/dm
         200 directory changed to /usr/dm
         MKD pathname
         553-Requested action not taken.
         553 Name already exists.

Notes:

There is no reply code "521". Per the tables of permitted result codes, this should have been some variation on "553 File name not allowed."

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