diff --git a/Build/V2rayUPort b/Build/V2rayUPort
new file mode 100755
index 0000000..ac0878c
Binary files /dev/null and b/Build/V2rayUPort differ
diff --git a/V2rayU.xcodeproj/project.pbxproj b/V2rayU.xcodeproj/project.pbxproj
index e885f9d..f786818 100644
--- a/V2rayU.xcodeproj/project.pbxproj
+++ b/V2rayU.xcodeproj/project.pbxproj
@@ -35,6 +35,7 @@
 		66973EB721797719001FEA1E /* ServiceManagement.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 66973EB621797719001FEA1E /* ServiceManagement.framework */; };
 		66ACB1A021757D5B005B5881 /* MainMenu.swift in Sources */ = {isa = PBXBuildFile; fileRef = 66ACB19F21757D5B005B5881 /* MainMenu.swift */; };
 		66BC2B89228C589E00FBB716 /* V2raySubscribe.swift in Sources */ = {isa = PBXBuildFile; fileRef = 66BC2B88228C589E00FBB716 /* V2raySubscribe.swift */; };
+		66C5B199240C1EF7008A22CA /* V2rayUPort in CopyFiles */ = {isa = PBXBuildFile; fileRef = 66C5B198240C1EEE008A22CA /* V2rayUPort */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
 		66F07CF9236D79540088A4AE /* ping.swift in Sources */ = {isa = PBXBuildFile; fileRef = 66F07CF8236D79540088A4AE /* ping.swift */; };
 		66F302A522AAA1D400FCA4E2 /* V2rayUTool in CopyFiles */ = {isa = PBXBuildFile; fileRef = 66F3029922AA9C0900FCA4E2 /* V2rayUTool */; settings = {ATTRIBUTES = (CodeSignOnCopy, ); }; };
 		66F411B121CA49EE007AAC10 /* pac in Copy Files */ = {isa = PBXBuildFile; fileRef = 6683B1EA21C2AD1A004A1C5F /* pac */; };
@@ -87,6 +88,7 @@
 			dstPath = "";
 			dstSubfolderSpec = 7;
 			files = (
+				66C5B199240C1EF7008A22CA /* V2rayUPort in CopyFiles */,
 				66F302A522AAA1D400FCA4E2 /* V2rayUTool in CopyFiles */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -176,6 +178,8 @@
 		66ACB19F21757D5B005B5881 /* MainMenu.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MainMenu.swift; sourceTree = "<group>"; };
 		66BC2B88228C589E00FBB716 /* V2raySubscribe.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = V2raySubscribe.swift; sourceTree = "<group>"; };
 		66C5B194240B58B8008A22CA /* en */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = en; path = ../en.lproj/PreferenceAdvance.strings; sourceTree = "<group>"; };
+		66C5B197240C17F2008A22CA /* main.go */ = {isa = PBXFileReference; lastKnownFileType = text; path = main.go; sourceTree = "<group>"; };
+		66C5B198240C1EEE008A22CA /* V2rayUPort */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.executable"; path = V2rayUPort; sourceTree = "<group>"; };
 		66F07CF8236D79540088A4AE /* ping.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ping.swift; sourceTree = "<group>"; };
 		66F3029922AA9C0900FCA4E2 /* V2rayUTool */ = {isa = PBXFileReference; lastKnownFileType = "compiled.mach-o.executable"; path = V2rayUTool; sourceTree = "<group>"; };
 		66F3029C22AAA0A600FCA4E2 /* zh-Hans */ = {isa = PBXFileReference; lastKnownFileType = text.plist.strings; name = "zh-Hans"; path = "zh-Hans.lproj/MainMenu.strings"; sourceTree = "<group>"; };
@@ -284,6 +288,7 @@
 			isa = PBXGroup;
 			children = (
 				6646669221CBC0860094F0B7 /* main.swift */,
+				66C5B197240C17F2008A22CA /* main.go */,
 			);
 			path = V2rayUTool;
 			sourceTree = "<group>";
@@ -352,6 +357,7 @@
 		66FEAD44217D75D7009DECF9 /* Build */ = {
 			isa = PBXGroup;
 			children = (
+				66C5B198240C1EEE008A22CA /* V2rayUPort */,
 				66F3029922AA9C0900FCA4E2 /* V2rayUTool */,
 				664FC05321A70C4300048FE3 /* build.plist */,
 				66FEAD45217D75FC009DECF9 /* release.sh */,
diff --git a/V2rayU/MainMenu.swift b/V2rayU/MainMenu.swift
index 7451ba9..51978d3 100644
--- a/V2rayU/MainMenu.swift
+++ b/V2rayU/MainMenu.swift
@@ -253,10 +253,9 @@ class MenuController: NSObject, NSMenuDelegate {
 
     // start v2ray core
     func startV2rayCore() {
-        self.setStatusOff()
-
         NSLog("start v2ray-core begin")
         if !V2rayLaunch.checkPorts() {
+            setStatusOff()
             return
         }
 
diff --git a/V2rayU/V2rayLaunch.swift b/V2rayU/V2rayLaunch.swift
index de62d3a..9c94e50 100644
--- a/V2rayU/V2rayLaunch.swift
+++ b/V2rayU/V2rayLaunch.swift
@@ -182,8 +182,15 @@ class V2rayLaunch: NSObject {
     }
 
     static func checkPorts() -> Bool {
+        // stop old v2ray process
+        self.Stop()
+        // stop pac server
+        webServer.stop()
+
         let localSockPort = UserDefaults.get(forKey: .localSockPort) ?? "1080"
+        let localSockHost = UserDefaults.get(forKey: .localSockHost) ?? "127.0.0.1"
         let localHttpPort = UserDefaults.get(forKey: .localHttpPort) ?? "1087"
+        let localHttpHost = UserDefaults.get(forKey: .localHttpHost) ?? "127.0.0.1"
         let localPacPort = UserDefaults.get(forKey: .localPacPort) ?? "11085"
 
         // check same port
@@ -203,13 +210,31 @@ class V2rayLaunch: NSObject {
         }
 
         // check port is used
-        print("UInt16(localSockPort)", UInt16(localSockPort) ?? 0)
-//        let (res, err) = self.checkTcpPort(port: UInt16(localSockPort) ?? 0)
-//        if !res {
-//            makeToast(message: "the sock port (" + localSockPort + ") has being used: (" + err + ")", displayDuration: 3)
-//            return false
-//        }
+        if !self.checkPort(host: localSockHost, port: localSockPort, tip: "socks") {
+            return false
+        }
 
+        if !self.checkPort(host: localHttpHost, port: localHttpPort, tip: "http") {
+            return false
+        }
+
+        if !self.checkPort(host: "0.0.0.0", port: localPacPort, tip: "pac") {
+            return false
+        }
+
+        // restart pac http server
+        startHttpServer()
+
+        return true
+    }
+
+    static func checkPort(host: String, port: String, tip: String) -> Bool {
+        // shell("/bin/bash",["-c","cd ~ && ls -la"])
+        let res = shell(launchPath: "/bin/bash", arguments: ["-c", "cd " + AppResourcesPath + " && ./V2rayUPort -h " + host + " -p " + port])
+        if res != "ok" {
+            makeToast(message: tip + " error:    " + (res ?? ""), displayDuration: 5)
+            return false
+        }
         return true
     }
 
diff --git a/V2rayUTool/main.go b/V2rayUTool/main.go
new file mode 100644
index 0000000..06e801a
--- /dev/null
+++ b/V2rayUTool/main.go
@@ -0,0 +1,39 @@
+/**
+ * Created by GoLand.
+ * User: yanue
+ * Date: 2019/2/28
+ * Time: 17:34
+ */
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net"
+)
+
+var host = ""
+var port = ""
+
+func init() {
+	flag.StringVar(&host, "h", "", "-h host")
+	flag.StringVar(&port, "p", "", "-p port")
+	flag.Parse()
+}
+
+const help = "V2rayUPort - check port is free \nUsage: \n  V2rayUPort -h host -p port"
+
+func main() {
+	if len(host) == 0 || len(port) == 0 {
+		fmt.Println(help)
+		return
+	}
+
+	_, err := net.Listen("tcp", host+":"+port)
+	if err != nil {
+		fmt.Println("err:", err.Error())
+		return
+	}
+	fmt.Println("ok")
+}