FTP connection wont stay open

Greeting,
I’m trying to set up an FTP site on my Win 2000 Adv Server.

I am able to log on etc…then the connection immediately closes.

230 User logged in.
Host type (I): Microsoft NT
PWD
257 “/” is current directory.
TYPE A
200 Type set to A.
PASV
227 Entering Passive Mode (xxx,xxx,x,x,9,210).
connecting data channel to xxx.xxx.x.x:2514
data channel connected to xxx.xxx.x.x:2514
LIST
426 Connection closed; transfer aborted.
426 Connection closed; transfer aborted.

Any ideas??