ssh2 Connection .connect()方法抛出连接过早关闭异常

import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.Session;
import ch.ethz.ssh2.StreamGobbler;
 
public class   manager{
 
    private final String  chineseToFirstLetter = xx;
    private final String hostName = "xx.xx.xx.xx";
    private final int port = xxxx;
    private final String userName = "xxxx";
    private final String password = "xxxx";
    
    //另一个服务器执行sql文件方法
    scriptSql.getConn(chineseToFirstLetter);
    Connection conn = new Connection(hostName,port);
    Session sess = null;
    try {
        conn.connect();
        boolean isAuthenticated = conn.authenticateWithPassword(userName,
                                        password);
        if (isAuthenticated == false) {
            return BaseDtoHttp.ofError(530,"连接不上服务器！");
        }
        sess = conn.openSession();
        sess.execCommand("sh D:/test/sql.sh"+ chineseToFirstLetter);
        InputStream stdout = new StreamGobbler(sess.getStdout());
        BufferedReader br = new BufferedReader(new InputStreamReader(stdout));
            while (true) {
                String line = br.readLine();
                if (line == null) {
                    break;
                }
                System.out.println(line);
            }
     } catch (IOException e) {
         return BaseDtoHttp.ofError(530,"创建失败！");
     } finally {
         sess.close();
         conn.close();
     }
}

在线等解决方案，谢谢