GetAddrInfoReqWrap.onlookup中的“错误：getaddrinfo ENOTFOUND SSH”

Question

在mysql工作台上，我使用连接方法Standard TCP/IP over SSH连接到了远程数据库。但是我很难在node.js中建立相同的连接。

我在MySQL工作台中使用的连接参数是： SSH Hostname，SSH Username，SSH Password，MySQL Hostname，MySQL Server Port，Username。包括Password在内的其他参数保留为空。

var mysql = require("mysql2");
var Client = require("ssh2").Client;
var ssh = new Client();

var db2 = new Promise(function(resolve, reject) {
  ssh
    .on("ready", function() {
      ssh.forwardOut(
        // source address, this can usually be any valid address
        "127.0.0.1",
        // source port, this can be any valid port number
        12345,
        // destination address (localhost here refers to the SSH server)
        "127.0.0.1",
        // destination port
        3306,
        function(err, stream) {
          console.log(stream);
          if (err) throw err; // SSH error: can also send error in promise ex. reject(err)
          // use `sql` connection as usual
          connection = mysql.createConnection({
            host: "MySQL Hostname",
            user: "username",
            password: "",
            database: "Default Schema",
            stream: stream
          });

          // send connection back in variable depending on success or not
          connnection.connect(function(err) {
            if (err) {
              resolve(connection);
            } else {
              reject(err);
            }
          });
        }
      );
    })
    .connect({
      host: "SSH Hostname",
      port: 22,
      username: "SSH Username",
      password: "SSH Password"
    });
});


module.exports = db2;

以下是错误消息：

Error: getaddrinfo ENOTFOUND SSH Hostname SSH Hostname:22
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:56:26)
Emitted 'error' event at:
    at Socket.<anonymous> (C:\Users\Sihoon Kim\Desktop\development\inventory_management\node_modules\ssh2\lib\client.js:306:10)
    at Socket.emit (events.js:189:13)
    at emitErrorNT (internal/streams/destroy.js:82:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
    at process._tickCallback (internal/process/next_tick.js:63:19)