Comments on: SFTP in Java

By: angelborroy

angelborroy — Thu, 02 Jul 2009 05:26:45 +0000

I didn’t know Zehon, but it sounds interesting. Thanks for the info, Skip.

By: Skip Johnson

Skip Johnson — Wed, 01 Jul 2009 19:07:08 +0000

I was evaluating this SFTP package from http://www.zehon.com. I thought it worked great and pretty easy to use and it’s free. I’m wondering if you are packaging this into some sort of an API.

By: angelborroy

angelborroy — Thu, 02 Apr 2009 18:50:57 +0000

Maybe your proxy does not have user authentication?
However this library is just a Beta version. You can try with http://www.sshtools.com/en/j2ssh-maverick/. If this software works, it seems to be a bug in j2ssh.

On the other hand, JSSH can be located on any computer.

By: Venu Madhav

Venu Madhav — Wed, 01 Apr 2009 09:00:46 +0000

Also I would like to know if the SSH and FTP server should reside on the same server for JSSH to work or can they be on a different server IP’s.

By: Venu Madhav

Venu Madhav — Wed, 01 Apr 2009 08:56:53 +0000

When I set proxy settings and just do a
client.connect() – it is sucessful
When I set the HOST and PasswordAuthentication it says connection refused. Is there any exact way to find the exact rejection during authentication. The connection refused exception I am getting is printed in the JUnit console.

By: angelborroy

angelborroy — Tue, 31 Mar 2009 06:35:07 +0000

It seems your proxy server is not accepting connections thought port 22. Try connecting proxy on port 80 and then do the FTP connection on port 22.

Luck!

By: Venu Madhav

Venu Madhav — Mon, 30 Mar 2009 14:56:51 +0000

Hi,

I would like to know the server setup. For me the FTP server is behind a Firewall. I need to do a SSH connection to firewall and then do a FTP connect. I am using setProxyHost setProxyUsername and setProxyPassword. But I am getting connection refused reply always. I am using PasswordAuthenticationClient for Host password authentication.

The below is the code

public void verifySSHConnection() throws IOException {
SshClient client = new SshClient();
SshConnectionProperties connectionProperties = new SshConnectionProperties();
connectionProperties.setProxyHost(PROX_HOST);
connectionProperties.setProxyPort(22);
connectionProperties.setProxyUsername(PROXY_UNAME);
connectionProperties.setProxyPassword(PROXY_PWD);
client.connect(connectionProperties, new IgnoreHostKeyVerification());
//this is behind the firewall and proxy has got access to it
connectionProperties.setHost(HOST_NAME);
PasswordAuthenticationClient authenticationClient = new PasswordAuthenticationClient();
authenticationClient.setUsername(HOST_UNAME);
authenticationClient.setPassword(HOST_PWD);
int result = client.authenticate(authenticationClient);
if (result == AuthenticationProtocolState.COMPLETE)
System.out.println(“success Authentication”);
else
System.out.println(“failed Authentication”);
System.out.println(client.isConnected());
SftpClient sftpClient = client.openSftpClient();
sftpClient.cd(“/”);
}

By: angelborroy

angelborroy — Wed, 30 Jul 2008 10:07:20 +0000

Thanks for your remark.
I’ve corrected the errata in the post.

By: Server Performance

Server Performance — Wed, 30 Jul 2008 08:10:41 +0000

You are right, surprisingly there are only a few options…

Your solutions is for “SFTP” (FTP over SSH), but if you would want to implement an “FTPS” client (FTP over SSL), the best option is Apache Commons Net, but changing the Socket Factory (it has a method for stablising it).

P.S: Great blog!