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Problem with FTP, WRT54G & NAS Synology DS-101

Discussion in 'Cisco/Linksys Wireless Routers' started by raikko, Jun 25, 2005.

  1. raikko

    raikko Network Guru Member

    Hi all,

    I recently bought a small server/NAS : the Synology DS-101 (www.synology.com). This is really great for such a price, by the way...

    This NAS has a FTP service function : once the service is activated, you can access all the files from the Internet.

    I have opened a DynDNS account and activated the DynDNS functionality in my WRT54G router (v.2, official firmware up-to-date).

    The problem is that when I want to access my FTP from a browser, the browser asks me for a username/password and brings me to the WRT54G configuration page. I have tried two methods : the DynDNS name and the IP, no success at all.

    If I try to connect to my FTp via SmartFTp with the DynDNS name, here's what I get :

    "SmartFTP v1.5.988.25
    Résolution du nom d'hôte "xxxxxx.homeftp.net"
    Connexion à xxx.xxx.xxx.xxx Port: 21
    Aucune connexion n'a pu être établie car l'ordinateur cible l'a expressément refusée.
    La client a fermé la connexion."

    Basically, the connection is refused. However, the IP is the right one, so it seems that the communication between the router and DynDNS is OK.

    What should I do ?

    Thanks !
  2. zyclone

    zyclone Network Guru Member

    did you forward port 21 on your router (WRT54G) , to the right local iP ?

    and you certainly need to set your ftp : 'port binding' to the right ip

    check for a config/setup file on your NAS.

    Host = xxxxxx.homeftp.net (better to use the resolved iP)
    Ports = 5000-5999 (Ports to use for data transfers)
    Bind = (connections are bound to this address instead of your HOST)

    all ftpd are using that kind of options, even the names differs from 1 software to another.
    that's needed for the server to be able to accept connections from a host , and to redirect/send the datas to the right place.

    I dunno your NAS, but I hope this can helps you.
  3. zyclone

    zyclone Network Guru Member


    if you try to connect via a www browser , like iexplorer , you 'll need to specify you wanna use ftp protocol.
    in iexplorer address bar, type : ftp://xxxxxx.homeftp.net
    will use default ftp port aka 21
    if you use another port ftp://xxxxxx.homeftp.net:2221

    if you just type : 'xxxxxx.homeftp.net' , iexplorer will understand http protocol via port 80.

  4. raikko

    raikko Network Guru Member

    Thanks for your help !

    Well... as my profile says it, I'm a network newbie... How can forward port 21 to my NAS on my router ? On which page is it located ? Is it on the page applications & gaming ? If yes, I can only see UDP and TCP? not FTP...
  5. zyclone

    zyclone Network Guru Member

    i assume you are using a WRT54G as router.
    default iP of the wrt is

    - login to your router (, enter your admin password

    - go to the 'APPLICATION & GAMING' page on your router (

    - 'Port Range Forward' is the page that interest us

    you'll see some blank fields.

    - under Application, add : 'ftp' (that's just the app name)
    - start : 21
    - end : 21
    - protocol : TCP (for all your internet apps , like ftp , torrent and other p2p, you will have to choose between tcp & udp)
    - IP Address : the address of your NAS , its local iP , such as
    - Enable : must be switched on
    - hit the save button

    that's all

    ps :
    . tcp & udp are transport layer protocols, they both use iP as network layer.
    . FTP file transfer use TCP.
    . TCP is more secure that UDP & iP ( i'm really not an expert , i can't tell you more about it)
  6. raikko

    raikko Network Guru Member


    It works !

    Actually, I did only one thing : the port forwarding. I can now access the NAS from outside. BY the way, I have forwarded the port 21 to the NAS IP, with both TCP and UDP. Should I keep the settings as they are, or put only UDP or TCP ?

    EDIT : oops, you've just answered to my questions !!!

    Thanks VERY much.
  7. zyclone

    zyclone Network Guru Member

    i'm pleased to be helpful


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