Last week, we had the author of TDD for a Shopping Website LiveProject. Friday at 11am Ranch time, Steven Solomon will be hosting a live TDD session just for us. See for the agenda and registration link
When I googled the error message you posted I found dozens of messages like yours on other forums over the last several years. When those messages had answers, they all seemed to suggest that the process of logging in to the server had failed. So, you provide the wrong login information and the server disconnects you. Then you try to continue using the server and you get that message.
I have a Java Application which is running every day.
This program fetches a txt file from FTP in that system and parse the File and archive that file into that FTP Server in that location.