Any suggestion?
possibly: https://bugzilla.redhat.com/show_bug.cgi?id=740399
I believe I've run into this problem/that bug as well.
As a workaround, I found that adding the following helped.
pasv_enable=YES pasv_min_port=35000 pasv_max_port=36000 pasv_address=xxx.xxx.xxx.xxx
If you are NAT'ing, however, it will break passive connections from your private network.
Hope that helps, Matt