Node.js-在Digital Ocean Server上连接ECONNREFUSED 139.59.16.149:3004

Question

当我启动节点服务器时，它启动了，然后连接被拒绝， 并且如果已连接但在我使用浏览器访问时仍然无法使用

      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE 139.59.16.149:3001
    at Object._errnoException (util.js:1022:11)
    at _exceptionWithHostPort (util.js:1044:20)
    at Server.setupListenHandle [as _listen2] (net.js:1367:14)
    at listenInCluster (net.js:1408:12)
    at doListen (net.js:1517:7)
    at _combinedTickCallback (internal/process/next_tick.js:141:11)
    at process._tickCallback (internal/process/next_tick.js:180:9)
    at Function.Module.runMain (module.js:695:11)
    at startup (bootstrap_node.js:188:16)
    at bootstrap_node.js:609:3

更改端口后

events.js:183
      throw er; // Unhandled 'error' event
      ^

Error: connect ECONNREFUSED 139.59.16.149:3004
    at Object._errnoException (util.js:1022:11)
    at _exceptionWithHostPort (util.js:1044:20)