Android Question FTP problems

Discussion in 'Android Questions' started by defillo, May 20, 2019.

  1. defillo

    defillo Member Licensed User

    Strange question driving me mad

    It happens only with certain connections

    same app, but different internet connection
    connection to a remote server, payed hosting (aruba.it)
    configured as

    ftp.PassiveMode=True
    ftp.UseSSL=False
    ftp.UseSSLExplicit=False


    what happens:

    - I connect using a H3G sim. everything works, all ftp commands are executed

    - I connect using landline optifiber connection: at all commands, reply is

    501 server cannot accept arguments




    connecting with another H3G Sim

    same result, 501 server cannot accept arguments

    same device, same connection, andFtp app: connection works , all commands executed

    Basically, the same app works or not according to the connection (SIM) you have.

    net library version 1.80, core 9.00, amdroid 28 sdk

    Getting mad about. and most of all, app unusable..

    any ideas?

    thanks in advance
     
    Last edited: May 21, 2019
  2. Erel

    Erel Administrator Staff Member Licensed User

    Worth testing with a different ftp server. Might be a configuration issue.
     
  3. defillo

    defillo Member Licensed User

    Erel, thanks for the reply.

    I've installed a filezilla server in the office.
    Now if I use the other SIM it works. file is correctly uploaded


    If I use the landline connection wifi (phone is connected to router wifi) with the App , trying to upload the same file with the app
    I get this reply
    000006)21/05/2019 19:28:46 - (not logged in) (93.38.67.223)> Connected on port 21, sending welcome message...
    (000006)21/05/2019 19:28:46 - (not logged in) (93.38.67.223)> 220-FileZilla Server 0.9.60 beta
    (000006)21/05/2019 19:28:46 - (not logged in) (93.38.67.223)> 220-written by Tim Kosse (tim.kosse@filezilla-project.org)
    (000006)21/05/2019 19:28:46 - (not logged in) (93.38.67.223)> 220 Please visit https://filezilla-project.org/
    (000006)21/05/2019 19:28:46 - (not logged in) (93.38.67.223)> USER guest
    (000006)21/05/2019 19:28:46 - (not logged in) (93.38.67.223)> 331 Password required for guest
    (000006)21/05/2019 19:28:46 - (not logged in) (93.38.67.223)> PASS *********
    (000006)21/05/2019 19:28:46 - guest (93.38.67.223)> 230 Logged on
    (000006)21/05/2019 19:28:46 - guest (93.38.67.223)> TYPE A
    (000006)21/05/2019 19:28:46 - guest (93.38.67.223)> 200 Type set to A
    (000006)21/05/2019 19:28:46 - guest (93.38.67.223)> PORT 100,97,20,179,163,170
    (000006)21/05/2019 19:28:46 - guest (93.38.67.223)> 421 Rejected command, requested IP address does not match control connection IP.
    and from the app
    org.apache.commons.net.ftp.FTPConnectionClosedException: FTP response 421 received. Server closed connection.

    BUT

    if i use an app like andFTP everything works..

    summarize:

    if I try to upload from the router wifi with the app and the net library, i get the error
    421 Rejected command, requested IP address does not match control connection IP.

    if using the same connection but with a commercial app like andFTP, i get a
    226 Successfully transferred "....................."

    so it really looks like a problem of the library..

    this is with the private filezilla, so I can check the messages on the server

    No way with the commercial server hosted, and that case also the other sim does not work with
    501 server cannot accept arguments

    pretty strange, can't get rid of this..
     
  4. Erel

    Erel Administrator Staff Member Licensed User

    It doesn't look like you are using passive mode.
     
  5. defillo

    defillo Member Licensed User

    if you read first post, you'll find ftp.PassiveMode=True

    maybe an option to log the server messages should help..


    furthermore

    with B4i (can connect only with landline as I use b4ibridge) error is
    error Error writing to stream: Error Domain=kCFErrorDomainCFNetwork Code=200 "(null)" UserInfo={kCFFTPStatusCodeKey=501, _kCFStreamErrorCodeKey=501, _kCFStreamErrorDomainKey=6}

    error 501 appears also on Ios
     
    Last edited: May 22, 2019
  6. defillo

    defillo Member Licensed User

    some tests

    using the app

    code:
    ftp.PassiveMode=True

    ftp.Initialize("ftp","***.***.***.***",21,"guest","*********")
    ftp.UseSSLExplicit=False
    ftp.UseSSL=False

    Dim sftp As Object = ftp.UploadFile(File.dirassets,"starter.bas",True,"starter.bas")
    Wait For (sftp) ftp_UploadCompleted (ServerPath As String, Success As Boolean)
    ftp.close
    If Success=False Then
    Log(LastException.Message)

    End If

    this is the server log

    (000424)22/05/2019 22:03:24 - (not logged in) (94.161.242.255)> 220 FileZilla Server 0.9.60 beta
    (000424)22/05/2019 22:03:24 - (not logged in) (94.161.242.255)> USER guest
    (000424)22/05/2019 22:03:24 - (not logged in) (94.161.242.255)> 331 Password required for guest
    (000424)22/05/2019 22:03:24 - (not logged in) (94.161.242.255)> PASS *********
    (000424)22/05/2019 22:03:24 - guest (94.161.242.255)> 230 Logged on
    (000424)22/05/2019 22:03:24 - guest (94.161.242.255)> TYPE A
    (000424)22/05/2019 22:03:24 - guest (94.161.242.255)> 200 Type set to A
    (000424)22/05/2019 22:03:24 - guest (94.161.242.255)> PORT 10,129,197,179,158,176
    (000424)22/05/2019 22:03:24 - guest (94.161.242.255)> 200 Port command successful
    (000424)22/05/2019 22:03:24 - guest (94.161.242.255)> STOR starter.bas
    (000424)22/05/2019 22:03:24 - guest (94.161.242.255)> 150 Opening data channel for file upload to server of "/starter.bas"
    (000424)22/05/2019 22:03:35 - guest (94.161.242.255)> 425 Can't open data connection for transfer of "/starter.bas"
    (000424)22/05/2019 22:04:25 - guest (94.161.242.255)> disconnected.

    looks like PASV mode is not entered


    same device, same connection but using app "andFtp"

    server log

    (000423)22/05/2019 22:00:49 - (not logged in) (94.161.242.255)> 220 FileZilla Server 0.9.60 beta
    (000423)22/05/2019 22:00:49 - (not logged in) (94.161.242.255)> USER guest
    (000423)22/05/2019 22:00:49 - (not logged in) (94.161.242.255)> 331 Password required for guest
    (000423)22/05/2019 22:00:50 - (not logged in) (94.161.242.255)> PASS *********
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 230 Logged on
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> FEAT
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 211-Features:
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> MDTM
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> REST STREAM
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> SIZE
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> MLST type*;size*;modify*;
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> MLSD
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> UTF8
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> CLNT
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> MFMT
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> EPSV
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> EPRT
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 211 End
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> CLNT AndFTP
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 200 Don't care
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> PWD
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 257 "/" is current directory.
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> NOOP
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 200 OK
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> CWD /
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 250 CWD successful. "/" is current directory.
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> FEAT
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 211-Features:
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> MDTM
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> REST STREAM
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> SIZE
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> MLST type*;size*;modify*;
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> MLSD
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> UTF8
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> CLNT
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> MFMT
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> EPSV
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> EPRT
    (000423)22/05/2019 22:00:50 - guest (94.161.242.255)> 211 End
    (000423)22/05/2019 22:00:51 - guest (94.161.242.255)> PASV
    (000423)22/05/2019 22:00:51 - guest (94.161.242.255)> 227 Entering Passive Mode (192,168,0,157,240,94)
    (000423)22/05/2019 22:00:51 - guest (94.161.242.255)> MLSD
    (000423)22/05/2019 22:00:51 - guest (94.161.242.255)> 150 Opening data channel for directory listing of "/"
    (000423)22/05/2019 22:00:51 - guest (94.161.242.255)> 226 Successfully transferred "/"
    (000423)22/05/2019 22:01:01 - guest (94.161.242.255)> NOOP
    (000423)22/05/2019 22:01:01 - guest (94.161.242.255)> 200 OK
    (000423)22/05/2019 22:01:01 - guest (94.161.242.255)> TYPE I
    (000423)22/05/2019 22:01:01 - guest (94.161.242.255)> 200 Type set to I
    (000423)22/05/2019 22:01:01 - guest (94.161.242.255)> CWD /
    (000423)22/05/2019 22:01:01 - guest (94.161.242.255)> 250 CWD successful. "/" is current directory.
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> SYST
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> 215 UNIX emulated by FileZilla
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> PASV
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> 227 Entering Passive Mode (192,168,0,157,195,244)
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> LIST
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> 150 Opening data channel for directory listing of "/"
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> 226 Successfully transferred "/"
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> PASV
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> 227 Entering Passive Mode (192,168,0,157,206,37)
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> STOR 20190421_053617.jpg
    (000423)22/05/2019 22:01:02 - guest (94.161.242.255)> 150 Opening data channel for file upload to server of "/20190421_053617.jpg"
    (000423)22/05/2019 22:01:12 - guest (94.161.242.255)> 226 Successfully transferred "/20190421_053617.jpg"
    (000423)22/05/2019 22:03:13 - guest (94.161.242.255)> 421 Connection timed out.

    PASV mode is correctly entered

    actually I am trying with 3 different connections. one is working, one does not enter PASV mode, and the other one gives 501 error..


    501 error also with b4i, and in this case I cannot test other connections due to bridge connection



    totally stuck as app MUST work with ALL connections...
     
  7. defillo

    defillo Member Licensed User

    and

    I've tried adding ftp.sendcommand("PASV","") and server jumps back in TYPE A

    (000438)22/05/2019 22:33:57 - (not logged in) (94.161.242.255)> 220 FileZilla Server 0.9.60 beta
    (000438)22/05/2019 22:33:57 - (not logged in) (94.161.242.255)> USER guest
    (000438)22/05/2019 22:33:57 - (not logged in) (94.161.242.255)> 331 Password required for guest
    (000438)22/05/2019 22:33:57 - (not logged in) (94.161.242.255)> PASS *********
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> 230 Logged on
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> PASV
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> 227 Entering Passive Mode (192,168,0,157,197,233)
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> TYPE A
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> 200 Type set to A
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> PORT 10,129,197,179,182,248
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> 200 Port command successful
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> STOR \0.jpg
    (000438)22/05/2019 22:33:57 - guest (94.161.242.255)> 150 Opening data channel for file upload to server of "/0.jpg"
    (000438)22/05/2019 22:34:08 - guest (94.161.242.255)> 425 Can't open data connection for transfer of "/0.jpg"
     
  8. José J. Aguilar

    José J. Aguilar Active Member Licensed User

    Have you tried to set pasive mode after initialize?
     
    Erel likes this.
  9. defillo

    defillo Member Licensed User

    WORKS on every connection....

    never thought about, thanks!
     
    José J. Aguilar likes this.
  10. defillo

    defillo Member Licensed User

    and works on IOS, too...! :)
     
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