JSchException timeout: socket is not established

问题:

I am trying to use JSch to connect to my computer through ssh and then run a command.

However, when I run the code I never connect to the computer. and the following error:

I/System.out: com.jcraft.jsch.JSchException: timeout: socket is not established

Here is my relevant code:

protected void sshTesting(){     String name = "";     String userName = "kalenpw";     String password = "hunter2";     String ip = "192.168.0.4";     int port = 22;     String command = "cmus-remote -u";      try{         JSch jsch = new JSch();         Session session = jsch.getSession(userName, ip, port);         session.setPassword(password);         session.setConfig("StrictHostKeyChecking", "no");           System.out.println("Establishing connection");         session.connect(10);          Channel channel = session.openChannel("exec");         ((ChannelExec)channel).setCommand(command);         channel.setInputStream(null);         channel.connect(10000);  //            name = session.getUserName(); //            System.out.println(session.getHost());       }     catch(Exception e){         System.err.print(e);         System.out.print(e);     }          } 

This is my first time using JSch so I am pretty much just following one of their examples Exec.java. I have found this answer JSch/SSHJ - Connecting to SSH server on button click which unfortunately my code looks like it is establishing a connection in a similar fashion yet with no results. I have tested SSHing into my computer normally and it works fine so I don't believe the issue is with the server, but with my code.

Here is the entire stack trace:

W/System.err: com.jcraft.jsch.JSchException: timeout: socket is not establishedcom.jcraft.jsch.JSchException: timeout: socket is not established W/System.err:     at com.jcraft.jsch.Util.createSocket(Util.java:394) W/System.err:     at com.jcraft.jsch.Session.connect(Session.java:215) W/System.err:     at com.example.kalenpw.myfirstapp.RectangleClickActivity.sshTesting(RectangleClickActivity.java:97) W/System.err:     at com.example.kalenpw.myfirstapp.RectangleClickActivity$1.onCheckedChanged(RectangleClickActivity.java:56) W/System.err:     at android.widget.CompoundButton.setChecked(CompoundButton.java:165) W/System.err:     at android.widget.Switch.setChecked(Switch.java:1151) W/System.err:     at android.widget.Switch.toggle(Switch.java:1146) W/System.err:     at android.widget.CompoundButton.performClick(CompoundButton.java:123) W/System.err:     at android.view.View$PerformClick.run(View.java:22589) W/System.err:     at android.os.Handler.handleCallback(Handler.java:739) W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95) W/System.err:     at android.os.Looper.loop(Looper.java:148) W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7325) W/System.err:     at java.lang.reflect.Method.invoke(Native Method) W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230) W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120) 

RectangleClickActivity.java is the file I am testing SSH.

line 97 is: session.connect(10);

line 56 is: sshTesting();

回答1:

The issue ended up being I was setting the config to session.setConfig("StrictHostKeyChecking", "no");, but for some reason you need to create a config and set the StrictHostKeyChecking and then add that config to the session instead of just setting it directly.

The working code looks like this:

protected void sshTesting(){     String name = "";     String userName = "kalenpw";     String password = "hunter2";     String ip = "192.168.0.4";     int port = 22;     String command = "cmus-remote -u";      try{         JSch jsch = new JSch();         Session session = jsch.getSession(userName, ip, port);         session.setPassword(password);          //Missing code         java.util.Properties config = new java.util.Properties();         config.put("StrictHostKeyChecking", "no");         session.setConfig(config);         //           System.out.println("Establishing connection");         session.connect(10);          Channel channel = session.openChannel("exec");         ((ChannelExec)channel).setCommand(command);         channel.setInputStream(null);         channel.connect(10000);  //            name = session.getUserName(); //            System.out.println(session.getHost());      }     catch(Exception e){         System.err.print(e);         System.out.print(e);     }          } 

文章来源: JSchException timeout: socket is not established