Thank you for the information. This means that I have to re-think as I
require, for example, 100 devices to send information to my server at the
same time.
Back to the original question. Why does the connection not work when I am
not running as root?
I beleive that the device(s) are using a passive connection as I get the
following trace (when running as root)
*13:14:27,390 INFO [FtpLoggingFilter] CREATED
13:14:27,398 INFO [FtpLoggingFilter] OPENED
13:14:27,422 INFO [FtpLoggingFilter] SENT: 220 Service ready for new user.
13:14:27,472 INFO [FtpLoggingFilter] RECEIVED: USER <USERNAME>
13:14:27,475 INFO [FtpLoggingFilter] SENT: 331 User name okay, need
password for <USERNAME>.
13:14:27,525 INFO [FtpLoggingFilter] RECEIVED: PASS *****
13:14:27,535 INFO [PASS] Login success - FTPROOT
13:14:27,536 INFO [FtpLoggingFilter] SENT: 230 User logged in, proceed.
13:14:27,584 INFO [FtpLoggingFilter] RECEIVED: PWD
13:14:27,585 INFO [FtpLoggingFilter] SENT: 257 "/" is current directory.
13:14:27,634 INFO [FtpLoggingFilter] RECEIVED: CWD <DIRECTORY>
13:14:27,635 INFO [FtpLoggingFilter] SENT: 250 Ok
13:14:27,684 INFO [FtpLoggingFilter] RECEIVED: CWD TestConn
13:14:27,685 INFO [FtpLoggingFilter] SENT: 250 Ok
13:14:27,734 INFO [FtpLoggingFilter] RECEIVED: EPSV
13:14:27,737 INFO [FtpLoggingFilter] SENT: 229 Entering Passive Mode
(|||10120|)
13:14:27,844 INFO [FtpLoggingFilter] RECEIVED: TYPE I
13:14:27,846 INFO [FtpLoggingFilter] SENT: 200 Command TYPE okay.
13:14:27,893 INFO [FtpLoggingFilter] RECEIVED: STOR TestConn.xml
13:14:27,948 INFO [FtpLoggingFilter] SENT: 150 Ok
13:14:27,948 INFO [FtpLoggingFilter] SENT: 226 Ok
13:14:28,031 INFO [FtpLoggingFilter] RECEIVED: QUIT
13:14:28,033 INFO [FtpLoggingFilter] SENT: 221 Goodbye.
13:14:28,033 INFO [FtpLoggingFilter] CLOSED*
When I am not running as root, I get the following trace:
*13:17:27,578 INFO [FtpLoggingFilter] CREATED
13:17:27,587 INFO [FtpLoggingFilter] OPENED
13:17:27,615 INFO [FtpLoggingFilter] SENT: 220 Service ready for new user.
13:17:27,666 INFO [FtpLoggingFilter] RECEIVED: USER <USERNAME>
13:17:27,669 INFO [FtpLoggingFilter] SENT: 331 User name okay, need
password for **<USERNAME>**.
13:17:28,213 INFO [FtpLoggingFilter] RECEIVED: PASS *****
13:17:28,222 INFO [PASS] Login success - FTPROOT
13:17:28,223 INFO [FtpLoggingFilter] SENT: 230 User logged in, proceed.
13:17:28,271 INFO [FtpLoggingFilter] RECEIVED: PWD
13:17:28,272 INFO [FtpLoggingFilter] SENT: 257 "/" is current directory.
13:17:28,320 INFO [FtpLoggingFilter] RECEIVED: CWD **<DIRECTORY>*
*13:17:28,320 INFO [FtpLoggingFilter] SENT: 250 Ok
13:17:28,367 INFO [FtpLoggingFilter] RECEIVED: CWD TestConn
13:17:28,367 INFO [FtpLoggingFilter] SENT: 250 Ok
13:17:28,414 INFO [FtpLoggingFilter] RECEIVED: EPSV
13:17:28,417 INFO [FtpLoggingFilter] SENT: 229 Entering Passive Mode
(|||10120|)
13:17:28,512 INFO [FtpLoggingFilter] RECEIVED: PASV
13:17:28,514 INFO [FtpLoggingFilter] SENT: 227 Entering Passive Mode
(10,101,64,144,39,136)
13:17:28,817 WARN [FtpLoggingFilter] EXCEPTION :
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:233)
at sun.nio.ch.IOUtil.read(IOUtil.java:206)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:207)
at
org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:179)
at
org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:41)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:585)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:563)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:552)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:56)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:891)
at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:651)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:676)
at java.lang.Thread.run(Thread.java:595)
13:17:28,819 ERROR [DefaultFtpHandler] Exception caught, closing session
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcher.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:21)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:233)
at sun.nio.ch.IOUtil.read(IOUtil.java:206)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:207)
at
org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:179)
at
org.apache.mina.transport.socket.nio.NioProcessor.read(NioProcessor.java:41)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:585)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:563)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:552)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:56)
at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:891)
at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:651)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:676)
at java.lang.Thread.run(Thread.java:595)
13:17:28,819 INFO [FtpLoggingFilter] CLOSED*
This suggests that something couldn't bind correctly.
I have the following setup in IPTABLES:
*DNAT tcp -- anywhere anywhere tcp
dpt:ftp-data to:<ipaddress>:10120
DNAT tcp -- anywhere anywhere tcp dpt:ftp to:
**<ipaddress>**:10121
*
Which maps port 20 to 10120 and 21 to 10121, and the following in my server
code:
* DataConnectionConfigurationFactory dataConnFactory = new
DataConnectionConfigurationFactory();
dataConnFactory.setPassivePorts("10120");
*
Thank you for the continued help.
On Fri, Mar 12, 2010 at 12:59 PM, Niklas Gustavsson <[email protected]>wrote:
> On Fri, Mar 12, 2010 at 12:57 PM, Aidan Diffey
> <[email protected]> wrote:
> > Further information on the port binding:
> > If I run my application as root, all is well. If I run as another user,
> I
> > get the "Connection reset by peer" message when the device attempts to
> > connect and send a file to the server.
> >
> > Let me check that I understand you.
> >
> > The device / devices that are attaching to my FTPServer use ports 20 and
> 21.
>
> The devices must be configured to use passive connections (the default
> is usually active connections).
>
> > If I map using IPTables port 20 to 10120 and port 21 to 10121 then I need
> to
> > bind my server to ports 10120 and 10121.
> > As I stated in the previous post, I cannot bind the server to 10120 and
> see
> > it appear on a netstat -a command.
>
> You will only see the port after the client sends the PASV command and
> it will only live for as long as the transfer over the data connection
> is in progress.
>
> > As for your second point, If I have 10 devices trying to communicate with
> my
> > FTPServer on ports 10120 and 10121, will they be able to connect
> > simultaneously, or will they have to connect sequentially?
>
> They will be able to connect to the control socket simultaneously, but
> only do data transfers sequentially.
>
> /niklas
>
