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FTP Issue - Cannot connect to server from network

  • 30-04-2014 10:29am
    #1
    um7y1h83ge06nx
    Closed Accounts Posts: 5,029 ✭✭✭


    Bit stumped here.

    We have a FTP that we can connect to from anywhere except the office network.

    Within the office network if we telnet to it we just get this....
    telnet ourserver.com 21

    421 Service not available.


    Connection to host lost.

    Doing this when connect to my phone or at home gets me connect. Same thing if I used the IP address rather than ourserver.com

    I can connect to a personal FTP server from the office network by just doing "telnet personalserver.com 21" so port 21 is not blocked.

    I have used some test sites to verify that the FTP server is okay - http://ftptest.net/

    Any ideas? :confused:


Comments

  • #2
    ED E
    Registered Users, Registered Users 2 Posts: 36,170 ✭✭✭✭ED E


    That means WAN incoming packets are getting to it, but LAN ones arent.

    Is it on a different subnet/vlan? Can you ping it locally?(ping its lan IP)


  • #3
    um7y1h83ge06nx
    Closed Accounts Posts: 5,029 ✭✭✭um7y1h83ge06nx


    Thanks.

    Yes, I can ping it.

    It's an FTP server for the company website supplied by the website hosting company so the server is external to the company network, just like my personal website server of course.

    Nice avatar by the way, great game!


  • #4
    ED E
    Registered Users, Registered Users 2 Posts: 36,170 ✭✭✭✭ED E


    Oh, thats weird then.

    Have you queried it with the hosting firm? Lots have really good support for teasing such problems out.


  • #5
    um7y1h83ge06nx
    Closed Accounts Posts: 5,029 ✭✭✭um7y1h83ge06nx


    ED E wrote: »
    Oh, that's weird then.

    Have you queried it with the hosting firm? Lots have really good support for teasing such problems out.

    No, we haven't contacted them yet but think we should as I'm just going around in circles at this stage.

    It's confusing the sh*t out of me. I'm a Developer not a network guru so I know a bit but I'm not an expert either.

    This is what my Filezilla client gives back:
    Status: Connecting to XXX.XX.XXX.XX:21...
    Status: Connection established, waiting for welcome message...
    Response: 421 Service not available.
    Error: Could not connect to server
    Status: Waiting to retry...
    Status: Delaying connection for 1 second due to previously failed connection attempt...
    Status: Connecting to XXX.XX.XXX.XX:21...
    Status: Connection established, waiting for welcome message...
    Response: 421 Service not available.
    Error: Could not connect to server


  • #6
    PeteFalk78
    Closed Accounts Posts: 762 ✭✭✭PeteFalk78


    FTP is a real messy protocol. It needs more ports opened than any other file transfer protocol.
    You'll need all TCP ports >1024 opened outbound if your firewall doesn't handle stateful connections.

    Did you try active/passive FTP? You may also need port 20 opened.

    It's almost certainly a firewall issue. Try post the output from a command prompt netstat (while you are trying the ftp connect) to see what is talking to what.


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