Nemi,
Has htis ever worked, or is this something you are trying to setup for the first time? If you own the FTP server you can just look at the ftp transaction logs and see if you are getting the proper flow of requests/responses from the BOE side. I suspect that your channel is being cut off however as Sohel is implying by something in the middel (i.e. a firewall or proxy). Perhaps you should try a different FTP site so that you can verify that the BOE configuration is correct and then move from there.
Alternatively, if you have the wireshark packages on your linux machine you can also use that for troubleshooting.