Upload failure

I am new to ftp and smartftp and I just logged on to my server and tried uploading some data to my website. I could see the tranfer going on fine and it showed 199 objects but in the end it failed and I got the following error message. I am not sure what I have done wrong or what I need to do next. Can someone help me please?
thanks
Heath

421 No Transfer Timeout (900 seconds): closing control connection.
An established connection was aborted by the software in your host machine.
Connection closed.

Hi, the best is to use global queue for all your transfers.