How to resolve SmartFoxServer connection error in unity

I'm using SmartFoxServer API on Unity3d. It was working fine before I recovered my MacBook, but now gives a connection error as below:

Http error creating http connection: System.Net.Sockets.SocketException: Connection refused
at System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP, Boolean requireSocketPolicy) [0x00000] in <filename unknown>:0
at System.Net.Sockets.Socket.Connect (System.Net.EndPoint remoteEP) [0x00000] in <filename unknown>:0
at System.Net.Sockets.TcpClient.Connect (System.Net.IPEndPoint remote_end_point) [0x00000] in <filename unknown>:0
at System.Net.Sockets.TcpClient.Connect (System.Net.IPAddress[] ipAddresses, Int32 port) [0x00000] in <filename unknown>:0
UnityEngine.Debug:Log(Object)
SFS2X_Connect:OnConnection(BaseEvent) (at Assets/SFS2X_Connect.cs:2758)
Sfs2X.Core.EventDispatcher:DispatchEvent(BaseEvent)
Sfs2X.SmartFox:ProcessEvents()
SFS2X_Connect:Update() (at Assets/SFS2X_Connect.cs:2764)

Here is the connection code:

using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;
using System.Collections;
using Sfs2X;
using Sfs2X.Core;


public class SFS2X_Connect : MonoBehaviour {


public string Host = "127.0.0.1";


[Tooltip("TCP port listened by the SmartFoxServer 2X instance; used for regular socket connection in all builds except WebGL")]
public int TcpPort = 9933;


[Tooltip("WebSocket port listened by the SmartFoxServer 2X instance; used for in WebGL build only")]
public int WSPort = 8888;


[Tooltip("Name of the SmartFoxServer 2X Zone to join")]
public string Zone = "examplezone";




SmartFox sfs;


sfs = new SmartFox ();


sfs.ThreadSafeMode = false;


sfs.AddEventListener (SFSEvent.CONNECTION, OnConnection);


ConfigData cfg = new ConfigData();


cfg.Host = Host;
cfg.Port = TcpPort;
cfg.Zone = Zone;


sfs.Connect (cfg);
}

I've removed and re-imported smartfox.dll but still encounter the same error.

What can I do?

Note: I create a new project and imported SnartFoxServer. It's connected to the server.