Agfdhyk

I have made an SSH client with JSch. The client is working correctly with my Apache Mina SSH server. But when I test it with a real equipment, it fails.

This is the code of the client:

public boolean openConnection() throws ItsSshException {



   boolean connectSuccess = false;

   Properties config = new Properties();

   config.put("StrictHostKeyChecking", "no");

   jschSSH.setConfig(config);

    try {

     sshSession = jschSSH.getSession(username, hostname, port);

     sshSession.setPassword(password);

     sshSession.connect(connectionTimeout);

     LOGGER.info("Connection timeout : " + connectionTimeout);

     Thread.sleep(1000);

     sshHChannel = sshSession.openChannel("shell");

     sshHChannel.connect();

     in = sshHChannel.getInputStream();

     out = new PrintStream(sshHChannel.getOutputStream());

     clearInitialSocketState();

     connectSuccess = true;

   } catch (Exception e) {

     LOGGER.error("Error during connecting to host: " + hostname +

                  ", port: " + port + "!", e);

     throw new ItsSshException("Error during connecting to host: " + e.getMessage());

   }

   LOGGER.info("connectSuccess : " + connectSuccess);

   return connectSuccess;

}

The code is failing at this point:

sshHChannel = sshSession.openChannel("shell");

Error during connecting to host: 127.0.0.1, port: 22!

com.jcraft.jsch.JSchException: session is down

at com.jcraft.jsch.Session.openChannel(Session.java:861)

My question is how to fix this problem and what can make it to occure?

This is JSch log:

INFO: Connecting to 127.0.0.1 port 22 

INFO: Connection established 

INFO: Remote version string: SSH-2.0-Mocana SSH

INFO: Local version string: SSH-2.0-JSCH-0.1.54

INFO: CheckCiphers: aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,3des-ctr,arcfour,arcfour128,arcfour256

INFO: aes256-ctr is not available.

INFO: aes192-ctr is not available.

INFO: aes256-cbc is not available.

INFO: aes192-cbc is not available.

INFO: CheckKexes: diffie-hellman-group14-sha1,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521

INFO: CheckSignatures: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521

INFO: SSH_MSG_KEXINIT sent

INFO: SSH_MSG_KEXINIT received

INFO: kex: server: diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

INFO: kex: server: ssh-dss,ssh-rsa

INFO: kex: server: aes256-cbc,rijndael256-cbc,aes192-cbc,rijndael192-cbc,aes128-cbc,rijndael128-cbc,3des-cbc,arcfour

INFO: kex: server: aes256-cbc,rijndael256-cbc,aes192-cbc,rijndael192-cbc,aes128-cbc,rijndael128-cbc,3des-cbc,arcfour

INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96

INFO: kex: server: hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96

INFO: kex: server: none

INFO: kex: server: none

INFO: kex: server: 

INFO: kex: server: 

INFO: kex: client: diffie-hellman-group1-sha1

INFO: kex: client: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521

INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc

INFO: kex: client: aes128-ctr,aes128-cbc,3des-ctr,3des-cbc,blowfish-cbc

INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96

INFO: kex: client: hmac-md5,hmac-sha1,hmac-sha2-256,hmac-sha1-96,hmac-md5-96

INFO: kex: client: none

INFO: kex: client: none

INFO: kex: client: 

INFO: kex: client: 

INFO: kex: server->client aes128-cbc hmac-md5 none

INFO: kex: client->server aes128-cbc hmac-md5 none

INFO: SSH_MSG_KEXDH_INIT sent

INFO: expecting SSH_MSG_KEXDH_REPLY

INFO: ssh_rsa_verify: signature true

WARN: Permanently added '127.0.0.1' (RSA) to the list of known hosts.

INFO: SSH_MSG_NEWKEYS sent

INFO: SSH_MSG_NEWKEYS received

INFO: SSH_MSG_SERVICE_REQUEST sent

INFO: SSH_MSG_SERVICE_ACCEPT received

INFO: Authentications that can continue: publickey,keyboard-interactive,password

INFO: Next authentication method: publickey

INFO: Authentications that can continue: keyboard-interactive,password

INFO: Next authentication method: keyboard-interactive

INFO: Authentications that can continue: password

INFO: Next authentication method: password

INFO: Authentication succeeded (password).

INFO: Caught an exception, leaving main loop due to End of IO Stream Read

INFO: Disconnecting from 127.0.0.1 port 22

Try to use:

Properties config = new Properties();

config.put("StrictHostKeyChecking", "no");

config.put("PreferredAuthentications", "password");

jschSSH.setConfig(config);

and also set

sshSession.connect(connectionTimeout) to 5000 or more.

also as Martin said

remove Thread.sleep(1000);

Remove this:

Thread.sleep(1000);

The server probably times out waiting for a request from the client (JSch) and aborts the connection.