SFTP client to Server communication via SOCKS5 server exception

[amolai]

I am trying to connect to a SFTP server via SOCK5 proxy from a custom SFTP client( Java) using the maverick library. Works fine.

But when I configure the proxy server to use no authentication, I get the following error.

java.io.IOException: Invalid response from SOCKS5 server (72) localhost:1080

The socks5 proxy server used is CCproxy.

This is my code.

`SshClient ssh = null;
SshClient forwardedConnection = null;
/**
* Create an SshConnector instance
*/
SshConnector con = SshConnector.getInstance();
Ssh2Context context = (Ssh2Context) con.getContext(SshConnector.SSH2);
setupContext(context);
context.setHostKeyVerification(new ConsoleKnownHostsKeyVerification());
SocketTransport t = new SocketTransport(hostname, port);
t.setTcpNoDelay(true);
//System.out.println("t.isConnected() ->" + t.isConnected());
ssh = con.connect(t, username, true);

	PasswordAuthentication pwd = new PasswordAuthentication();
	pwd.setPassword(password);
	ssh.authenticate(pwd);
	
	
	if (ssh.isAuthenticated()) {	
		System.out.println("authenticated");
		
		// Connect via socks5 proxy
		SshTransport spt = SocksProxyTransport.connectViaSocks5Proxy(hostname, port, proxyServerHost, proxyServerPort, proxyServerUsername,proxyServerPassword);
		//SshTransport spt = HttpProxyTransport.connectViaProxy(hostname, port, proxyServerHost, proxyServerPort, proxyServerUsername, proxyServerPassword, "Maverick");
		forwardedConnection = con.connect(spt, username);
		PasswordAuthentication pwd2 = new PasswordAuthentication();
		pwd2.setPassword(password);
		forwardedConnection.authenticate(pwd2);
	}
	return forwardedConnection;
}`

[ludup]

The SOCKS5 proxy does not appear to be responding correctly.

Interestingly the response code '72' is the ascii value for 'H' which forms part of the initial output of the server 'SSH-2.0......'

Would be useful to debug the connectViaSocks5Proxy method to see exactly where it is returning this error as there are 3 places it could be.