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error in channel connection #485

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luca-ma opened this issue Jan 20, 2024 · 7 comments
Closed

error in channel connection #485

luca-ma opened this issue Jan 20, 2024 · 7 comments

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@luca-ma
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luca-ma commented Jan 20, 2024

I'm working with the original Jsch library (com.jcraft.jsch v. 0.1.55)
to send and receive files to an sftp server

I switched to the library (com.github.mwiede.jsch, v. 0.2.16) but I've an error in channel connection

This is my code

	JSch jsch = new JSch();
    Session session = null;
    Channel channel = null;
	
	session = jsch.getSession(
				"username",
				"server", 
				port);
	java.util.Properties config = new java.util.Properties(); 
	config.put("StrictHostKeyChecking", "no");
	session.setConfig(config);
		
	session.setPassword(System.getProperty("password"));
		
    session.connect(60*1000);
		
    channel = session.openChannel("sftp");
    boolean closed = channel.isClosed();  //prints false
    boolean connected = channel.isConnected();//prints false
    channel.connect(60000); //here raise com.jcraft.jsch.JSchException: channel is not opened.

Can anyone give me a suggestion?
@mwiede
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mwiede commented Jan 20, 2024

Please use one of the loggers to show the output of the logs. My first guess is that you use ssh-rsa which is deactivated by default in the fork.

@luca-ma
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luca-ma commented Jan 20, 2024

I'm sorry
I don't understand which logs you are referring to and, if so, how to activate them
can you give an example?
thank you very much

@mwiede
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mwiede commented Jan 20, 2024

The fork includes a few built-in loggers for various frameworks, see JplLogger, JulLogger, Log4j2Logger & Slf4jLogger.
Any of the above loggers can be enabled with the JSch.setLogger(), JSch.setInstanceLogger() or Session.setLogger() methods.

@luca-ma
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luca-ma commented Jan 20, 2024 •
edited
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Ok I've added JplLogger
private final static Logger log = new JplLogger();
....
JSch.setLogger(log);

and my test logs are as follows:

Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Connecting to xx.yyy.it port 8022
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Connection established
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Remote version string: SSH-2.0-SSHD
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Local version string: SSH-2.0-JSCH_0.2.16
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: CheckCiphers: chacha20-poly1305@openssh.com
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: CheckKexes: sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,curve448-sha512
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: sntrup761x25519-sha512@openssh.com is not available.
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: CheckSignatures: ssh-ed25519,ssh-ed448
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: ssh-ed25519 is not available.
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: ssh-ed448 is not available.
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_KEXINIT sent
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_KEXINIT received
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: ext-info messaging supported by server
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: KEX algorithms: rsa2048-sha256,diffie-hellman-group18-sha512,diffie-hellman-group17-sha512,diffie-hellman-group16-sha512,diffie-hellman-group15-sha512,diffie-hellman-group14-sha256,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp384,curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp521,ecdh-sha2-nistp256,ext-info-s
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: ciphers c2s: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: ciphers s2c: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: MACs c2s: hmac-sha2-256,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-512-etm@openssh.com
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: MACs s2c: hmac-sha2-256,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-512-etm@openssh.com
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: compression c2s: none,zlib
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: compression s2c: none,zlib
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: languages c2s:
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server proposal: languages s2c:
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c,kex-strict-c-v00@openssh.com
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: host key algorithms: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-512,rsa-sha2-256
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: ciphers c2s: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: ciphers s2c: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: MACs c2s: hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: MACs s2c: hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: compression c2s: none
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: compression s2c: none
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: languages c2s:
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: client proposal: languages s2c:
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: kex: algorithm: curve25519-sha256
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: kex: host key algorithm: rsa-sha2-512
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256-etm@openssh.com compression: none
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256-etm@openssh.com compression: none
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_KEX_ECDH_INIT sent
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: expecting SSH_MSG_KEX_ECDH_REPLY
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: ssh_rsa_verify: rsa-sha2-512 signature true
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
WARNING: Permanently added '[xx.yy.it]:8022' (RSA) to the list of known hosts.
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_NEWKEYS sent
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_NEWKEYS received
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_EXT_INFO sent
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_SERVICE_REQUEST sent
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_EXT_INFO received
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: server-sig-algs=<ssh-rsa,x509v3-rsa2048-sha256,rsa-sha2-256,rsa-sha2-512>
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: SSH_MSG_SERVICE_ACCEPT received
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Authentications that can continue: publickey,keyboard-interactive,password
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Next authentication method: publickey
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Authentications that can continue: keyboard-interactive,password
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Next authentication method: keyboard-interactive
Jan 20, 2024 5:00:12 PM com.jcraft.jsch.JplLogger log
INFO: Authentication succeeded (keyboard-interactive).
[24-01-20 17:00:12.424] {RMI TCP Connection(4)-192.168.56.1} Connecting to xx.yyy.it port 8022
[24-01-20 17:00:12.459] {RMI TCP Connection(4)-192.168.56.1} Connection established
[24-01-20 17:00:12.469] {RMI TCP Connection(4)-192.168.56.1} Remote version string: SSH-2.0-SSHD
[24-01-20 17:00:12.470] {RMI TCP Connection(4)-192.168.56.1} Local version string: SSH-2.0-JSCH_0.2.16
[24-01-20 17:00:12.470] {RMI TCP Connection(4)-192.168.56.1} CheckCiphers: chacha20-poly1305@openssh.com
[24-01-20 17:00:12.471] {RMI TCP Connection(4)-192.168.56.1} CheckKexes: sntrup761x25519-sha512@openssh.com,curve25519-sha256,curve25519-sha256@libssh.org,curve448-sha512
[24-01-20 17:00:12.509] {RMI TCP Connection(4)-192.168.56.1} sntrup761x25519-sha512@openssh.com is not available.
[24-01-20 17:00:12.509] {RMI TCP Connection(4)-192.168.56.1} CheckSignatures: ssh-ed25519,ssh-ed448
[24-01-20 17:00:12.514] {RMI TCP Connection(4)-192.168.56.1} ssh-ed25519 is not available.
[24-01-20 17:00:12.514] {RMI TCP Connection(4)-192.168.56.1} ssh-ed448 is not available.
[24-01-20 17:00:12.518] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_KEXINIT sent
[24-01-20 17:00:12.519] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_KEXINIT received
[24-01-20 17:00:12.519] {RMI TCP Connection(4)-192.168.56.1} ext-info messaging supported by server
[24-01-20 17:00:12.519] {RMI TCP Connection(4)-192.168.56.1} server proposal: KEX algorithms: rsa2048-sha256,diffie-hellman-group18-sha512,diffie-hellman-group17-sha512,diffie-hellman-group16-sha512,diffie-hellman-group15-sha512,diffie-hellman-group14-sha256,diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp384,curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp521,ecdh-sha2-nistp256,ext-info-s
[24-01-20 17:00:12.520] {RMI TCP Connection(4)-192.168.56.1} server proposal: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256
[24-01-20 17:00:12.520] {RMI TCP Connection(4)-192.168.56.1} server proposal: ciphers c2s: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
[24-01-20 17:00:12.520] {RMI TCP Connection(4)-192.168.56.1} server proposal: ciphers s2c: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
[24-01-20 17:00:12.520] {RMI TCP Connection(4)-192.168.56.1} server proposal: MACs c2s: hmac-sha2-256,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-512-etm@openssh.com
[24-01-20 17:00:12.520] {RMI TCP Connection(4)-192.168.56.1} server proposal: MACs s2c: hmac-sha2-256,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-512-etm@openssh.com
[24-01-20 17:00:12.521] {RMI TCP Connection(4)-192.168.56.1} server proposal: compression c2s: none,zlib
[24-01-20 17:00:12.521] {RMI TCP Connection(4)-192.168.56.1} server proposal: compression s2c: none,zlib
[24-01-20 17:00:12.521] {RMI TCP Connection(4)-192.168.56.1} server proposal: languages c2s:
[24-01-20 17:00:12.522] {RMI TCP Connection(4)-192.168.56.1} server proposal: languages s2c:
[24-01-20 17:00:12.522] {RMI TCP Connection(4)-192.168.56.1} client proposal: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c,kex-strict-c-v00@openssh.com
[24-01-20 17:00:12.523] {RMI TCP Connection(4)-192.168.56.1} client proposal: host key algorithms: ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,rsa-sha2-512,rsa-sha2-256
[24-01-20 17:00:12.523] {RMI TCP Connection(4)-192.168.56.1} client proposal: ciphers c2s: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
[24-01-20 17:00:12.523] {RMI TCP Connection(4)-192.168.56.1} client proposal: ciphers s2c: aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
[24-01-20 17:00:12.524] {RMI TCP Connection(4)-192.168.56.1} client proposal: MACs c2s: hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
[24-01-20 17:00:12.524] {RMI TCP Connection(4)-192.168.56.1} client proposal: MACs s2c: hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
[24-01-20 17:00:12.524] {RMI TCP Connection(4)-192.168.56.1} client proposal: compression c2s: none
[24-01-20 17:00:12.524] {RMI TCP Connection(4)-192.168.56.1} client proposal: compression s2c: none
[24-01-20 17:00:12.525] {RMI TCP Connection(4)-192.168.56.1} client proposal: languages c2s:
[24-01-20 17:00:12.525] {RMI TCP Connection(4)-192.168.56.1} client proposal: languages s2c:
[24-01-20 17:00:12.527] {RMI TCP Connection(4)-192.168.56.1} kex: algorithm: curve25519-sha256
[24-01-20 17:00:12.527] {RMI TCP Connection(4)-192.168.56.1} kex: host key algorithm: rsa-sha2-512
[24-01-20 17:00:12.527] {RMI TCP Connection(4)-192.168.56.1} kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256-etm@openssh.com compression: none
[24-01-20 17:00:12.527] {RMI TCP Connection(4)-192.168.56.1} kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256-etm@openssh.com compression: none
[24-01-20 17:00:12.530] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_KEX_ECDH_INIT sent
[24-01-20 17:00:12.530] {RMI TCP Connection(4)-192.168.56.1} expecting SSH_MSG_KEX_ECDH_REPLY
[24-01-20 17:00:12.556] {RMI TCP Connection(4)-192.168.56.1} ssh_rsa_verify: rsa-sha2-512 signature true
[24-01-20 17:00:12.556] {RMI TCP Connection(4)-192.168.56.1} Permanently added '[xx.yy.it]:8022' (RSA) to the list of known hosts.
[24-01-20 17:00:12.557] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_NEWKEYS sent
[24-01-20 17:00:12.557] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_NEWKEYS received
[24-01-20 17:00:12.570] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_EXT_INFO sent
[24-01-20 17:00:12.571] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_SERVICE_REQUEST sent
[24-01-20 17:00:12.572] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_EXT_INFO received
[24-01-20 17:00:12.572] {RMI TCP Connection(4)-192.168.56.1} server-sig-algs=<ssh-rsa,x509v3-rsa2048-sha256,rsa-sha2-256,rsa-sha2-512>
[24-01-20 17:00:12.581] {RMI TCP Connection(4)-192.168.56.1} SSH_MSG_SERVICE_ACCEPT received
[24-01-20 17:00:12.591] {RMI TCP Connection(4)-192.168.56.1} Authentications that can continue: publickey,keyboard-interactive,password
[24-01-20 17:00:12.591] {RMI TCP Connection(4)-192.168.56.1} Next authentication method: publickey
[24-01-20 17:00:12.592] {RMI TCP Connection(4)-192.168.56.1} Authentications that can continue: keyboard-interactive,password
[24-01-20 17:00:12.592] {RMI TCP Connection(4)-192.168.56.1} Next authentication method: keyboard-interactive
[24-01-20 17:00:12.659] {RMI TCP Connection(4)-192.168.56.1} Authentication succeeded (keyboard-interactive).
Jan 20, 2024 5:00:49 PM com.caucho.util.AlarmClock dispatch
WARNING: AlarmClock slow alarm Alarm[alarm[com.caucho.server.distcache.DataStore$DeleteAlarm@4f7c0be3]] 52749ms coordinator-delta 63382ms
[24-01-20 17:00:49.353] {CoordinatorThread[]-3} AlarmClock slow alarm Alarm[alarm[com.caucho.server.distcache.DataStore$DeleteAlarm@4f7c0be3]] 52749ms coordinator-delta 63382ms
Jan 20, 2024 5:00:49 PM com.caucho.util.AlarmClock dispatch
WARNING: AlarmClock slow alarm Alarm[alarm[SessionManager[/xxx]]] 45831ms coordinator-delta 63383ms
[24-01-20 17:00:49.354] {CoordinatorThread[]-3} AlarmClock slow alarm Alarm[alarm[SessionManager[/xx]]] 45831ms coordinator-delta 63383ms
Jan 20, 2024 5:00:49 PM com.caucho.util.AlarmClock dispatch
WARNING: AlarmClock slow alarm Alarm[alarm[ServletService[id=default,cluster=]]] 43473ms coordinator-delta 63384ms
[24-01-20 17:00:49.354] {CoordinatorThread[]-3} AlarmClock slow alarm Alarm[alarm[ServletService[id=default,cluster=]]] 43473ms coordinator-delta 63384ms
Jan 20, 2024 5:00:49 PM com.caucho.util.AlarmClock dispatch
WARNING: AlarmClock slow alarm Alarm[alarm[DeployControllerAlarm[null]]] 43473ms coordinator-delta 63384ms
[24-01-20 17:00:49.355] {CoordinatorThread[]-3} AlarmClock slow alarm Alarm[alarm[DeployControllerAlarm[null]]] 43473ms coordinator-delta 63384ms
Jan 20, 2024 5:00:49 PM com.caucho.util.AlarmClock dispatch
WARNING: AlarmClock slow alarm Alarm[alarm[com.caucho.network.listen.TcpPort$SuspendReaper@4d228131]] 43458ms coordinator-delta 63385ms
[24-01-20 17:00:49.356] {CoordinatorThread[]-3} AlarmClock slow alarm Alarm[alarm[com.caucho.network.listen.TcpPort$SuspendReaper@4d228131]] 43458ms coordinator-delta 63385ms
Jan 20, 2024 5:00:49 PM com.caucho.util.AlarmClock dispatch
WARNING: AlarmClock slow alarm Alarm[alarm[DeployControllerAlarm[null]]] 43440ms coordinator-delta 63386ms
[24-01-20 17:00:49.356] {CoordinatorThread[]-3} AlarmClock slow alarm Alarm[alarm[DeployControllerAlarm[null]]] 43440ms coordinator-delta 63386ms
com.jcraft.jsch.JSchException: channel is not opened.
at com.jcraft.jsch.Channel.sendChannelOpen(Channel.java:832)
at com.jcraft.jsch.Channel.connect(Channel.java:161)

thanks

@luca-ma
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luca-ma commented Jan 22, 2024

let me know if you need any other log or any other information for analyzing my problem

@mwiede
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mwiede commented Jan 22, 2024

are you sure, that the issue comes from switching the library? When looking at google results, it seems, it's a popular issue which is caused by timeout and server workload.

does it occur always or just sometimes?
have you looked at the server logs?

@luca-ma
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luca-ma commented Jan 23, 2024

yes you're right
I get the same error even with the original library, there must be a reachability problem...
Thank you

@mwiede mwiede closed this as completed Feb 22, 2024
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