WS_FTP - Error: 503 No PORT command issued first

Question/Problem: I logged on with WS_FTP successfully, but when I tried to upload some files I got this error, 503 No PORT command issued first.

Answer/Solution: Try setting Passive Mode off. (Find this on the Host Info tab in the Connection screen which comes up when you open the program.)

See also: Multiple PORT command errors

WS_FTP Pro 8.0 User's Guide - Connections