You need to setup IP Port Forwarding (see the How To's at 
http://myezserver.com) and you will also have to use a FTP client that supports a passive setup.  I personally use GuildFTP server on my 2K machine with 4 ports forwarded from my SME v5.1.2 box to my 2K machine.  Works great.
Terry
David MONDON wrote:
> 
> Hello,
> 
> I previously had a FTP server accessible from Internet.
> 
> I've got now a SME Server 5.1.2 as gateway and want to acces
> my FTP server (hosted on a station on the lan) via internet.
> 
> Is it possible to continue to access this FTP server from
> internet through the gateway ?
> 
> If no: just too bad...i don't have enough space on my server
> to host this ftp (2Gb) and my FTP is 120 Gb large....
> 
> If yes: great !! How should I proceed ?
> 
> thx