Android Question FTP Error - java.net.SocketException: Connection reset

[RickV]

Hi, I am using the latest jnet library and copied the code for the ftp server side and the b4a client side.

java.net.SocketException: Connection reset

I am receiving this error, and I am out of rope. I have no idea what to look for to determine the cause.

B4J part on Win 11 box, usernames and passwords set etc etc

Client side code

            Starter.Ftp.Initialize("FTP", "192.168.1.240", 21, "zz", "zz")
            Starter.Ftp.PassiveMode = True
            Starter.Ftp.UseSSL = False
            Starter.Ftp.UseSSLExplicit = False
            Dim sf As Object = Starter.Ftp.UploadFile(File.Dirinternal, "temp.jpg", False, "/temp.jpg")
            'occurs here  -  java.net.SocketException: Connection reset

            Wait For (sf) FTP_UploadCompleted (ServerPath As String, Success As Boolean)
            Starter.Ftp.Close

Server side code

    FTPSer.Initialize(Me, "FTPServer")
    FTPSer.SetPorts(21, 65500, 65535)
    FTPSer.AddUser("zz", "zz")
    FTPSer.BaseDir = IIf(xui.IsB4J, "c:\data\ftp", xui.DefaultFolder)
    FTPSer.BaseDir = "c:\data\ftp"
    xui.SetDataFolder(":\data\ftp")
    FTPSer.Start
    'loop bit removed as has UI

 

[RickV]

Server side log

Number of clients: 1
client: USER zz
client: PASS zz
User logged in: zz
client: TYPE I
client: PASV
java.net.SocketException: Software caused connection abort: socket write error
    at java.base/java.net.SocketOutputStream.socketWrite0(Native Method)
    at java.base/java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:110)
    at java.base/java.net.SocketOutputStream.write(SocketOutputStream.java:138)
    at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AOUT.run(AsyncStreams.java:380)
    at java.base/java.lang.Thread.run(Thread.java:834)
java.net.SocketException: Software caused connection abort: recv failed
    at java.base/java.net.SocketInputStream.socketRead0(Native Method)
    at java.base/java.net.SocketInputStream.socketRead(SocketInputStream.java:115)
    at java.base/java.net.SocketInputStream.read(SocketInputStream.java:168)
    at java.base/java.net.SocketInputStream.read(SocketInputStream.java:140)
    at java.base/java.net.SocketInputStream.read(SocketInputStream.java:126)
    at anywheresoftware.b4a.randomaccessfile.AsyncStreams$AIN.run(AsyncStreams.java:232)
    at java.base/java.lang.Thread.run(Thread.java:834)
error: (SocketException) java.net.SocketException: Software caused connection abort: recv failed
error: (SocketException) java.net.SocketException: Software caused connection abort: recv failed
terminated
DataConnection_Close
Number of clients: 1
terminated

 

[teddybear]

Using ftptool or cmdline ftp checks whether the ftpserver is ok.

 

[RickV]

Using ftptool or cmdline ftp checks whether the ftpserver is ok.

Is ftptool an external to d4x? Where do I find fiptool?

Sorry Im pretty dumb when it comes to java, could you point me to some doc on the command line option for testing the ftp server operation please.

I have used windows file explorer ftp://192.168.1.240, log in with username and password and receive the error message attached.

 

[RickV]

I installed a ftp client with some level of diagnostics, here is the logs...
What should I do do you think to resolve this ?
I dont have SSL certificates

Connecting to 192.168.1.240:21...
Status:    Connection established, waiting for welcome message...
Response:    220 B4X FTP Server
Command:    AUTH TLS
Response:    451 Not logged in
Command:    AUTH SSL
Response:    451 Not logged in
Status:    Insecure server, it does not support FTP over TLS.
Command:    USER zz
Response:    331 
Command:    PASS **
Response:    230 
Command:    OPTS UTF8 ON
Response:    500 Unknown command: OPTS
Status:    Logged in
Status:    Retrieving directory listing...
Command:    PWD
Response:    257 "/"
Command:    TYPE I
Response:    200 
Command:    PASV
Error:    Disconnected from server: ECONNABORTED - Connection aborted
Error:    Failed to retrieve directory listing

 

[RickV]

furthermore, both end appear to stay connected, I can send a "custom command" from the ftp client being LIST, can even send "hello" and see it. I see that it appears in the b4j logs window immediately followed by the error below... for LIST that is.
(RuntimeException) java.lang.RuntimeException: Class instance was not initialized (ftpdataconnection)
so something isn't being made at the time of connection ???

 

[teddybear]

Don't use port 21, change ftp server port to 51041.(>1024)

 

[RickV]

Don't use port 21, change ftp server port to 51041.(>1024)

NO WAY !!!!
I can't believe that worked, on port 2000 STRAIGH T AWAY

Thank you Thank you Thank you Thank you Thank you