I am trying to connect to a SFTP remote server using JSCH library version 0.1.49. Every time I run the program I receive the following error :
Initializing...
Connection to SFTP server is successfully
com.jcraft.jsch.JSchException: Unable to connect to SFTP server.com.jcraft.jsch.JSchException: failed to send channel request
at shell.MainClass.JschConnect(MainClass.java:95)
at shell.MainClass.main(MainClass.java:30)
line 30 is : sftpChannel.connect()
from the code below :
System.out.println("Initializing...");
JSch jsch = new JSch();
Session session = null;
try {
session = jsch.getSession(ProjectConstants.rmUsername,ProjectConstants.rmHost, 22);
session.setPassword(ProjectConstants.rmPassword);
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
if (session.isConnected() == true) {
System.out.println("Connection to SFTP server is successfully");
}
ChannelSftp sftpChannel = (ChannelSftp) session.openChannel("sftp");
try {
sftpChannel.connect();
} catch (Exception e) {
throw new JSchException("Unable to connect to SFTP server. "
+ e.toString());
}
the credentials I am using are correct ( it connects through FileZilla using the same data ), and I also disabled the proxy for that server ( either way I get the same error with or without proxy )
If anyone could help me I would greatly appreciate it as I am stuck with this error for about a week now ...
Thank you.
Check Subsystem sftp /usr/lib/openssh/sftp-server
in /etc/ssh/sshd_config
Check if SFTP server is started and running.
I had encountered the same issue - I was not able to open SFTP channel to my server, but I could connect with WinSCP. It took me some time to notice that WinSCP would fallback to SCP hence confusing me. Starting the server solved this issue.
In /etc/ssh/sshd_config
I changed:
Subsystem sftp /usr/lib/openssh/sftp-server
to:
Subsystem sftp internal-sftp
It helps.
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