Speed Limit

hi.

i'm trying to limit the up/down speed from servers FTP service.

have done this:
QoS
Status:
activated the service on Wan connection

Traffikc selectors:
Server-> FTP service>any
any>FTP service >Server

Bandwidth Pools
sat the limit on 50 garanteed and upper limmit 50k

nothing happens!

is there more to it?