diff --git a/punchnet.xcodeproj/xcuserdata/anlicheng.xcuserdatad/xcschemes/xcschememanagement.plist b/punchnet.xcodeproj/xcuserdata/anlicheng.xcuserdatad/xcschemes/xcschememanagement.plist
index 4e9260e..516c2c6 100644
--- a/punchnet.xcodeproj/xcuserdata/anlicheng.xcuserdatad/xcschemes/xcschememanagement.plist
+++ b/punchnet.xcodeproj/xcuserdata/anlicheng.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -7,12 +7,12 @@
 		<key>Tun.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>0</integer>
+			<integer>1</integer>
 		</dict>
 		<key>punchnet.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>1</integer>
+			<integer>0</integer>
 		</dict>
 	</dict>
 </dict>
diff --git a/punchnet/ContentView.swift b/punchnet/ContentView.swift
index baeab9f..8256770 100644
--- a/punchnet/ContentView.swift
+++ b/punchnet/ContentView.swift
@@ -75,7 +75,11 @@ struct ContentView: View {
                 .cornerRadius(5.0)
                 .onTapGesture {
                     Task {
-                        try await self.clickSwitchButton()
+                        do {
+                            try await self.clickSwitchButton()
+                        } catch let err {
+                            NSLog("start vpn get error: \(err)")
+                        }
                     }
                 }
             
diff --git a/punchnet/Core/PunchnetConfig.swift b/punchnet/Core/PunchnetConfig.swift
index c8e9dbe..0fd065f 100644
--- a/punchnet/Core/PunchnetConfig.swift
+++ b/punchnet/Core/PunchnetConfig.swift
@@ -6,15 +6,21 @@
 //
 import Foundation
 
+enum PunchnetError: Error {
+    case dnsUnreachable
+}
+
 struct PunchnetConfig {
     static let server = "punchnet.aioe.tech"
     static let port = 18083
     
-    static func getOptions() -> [String:NSObject] {
+    static func getOptions() throws -> [String:NSObject] {
         var options: [String: NSObject] = [:]
         
         if let ip = DNSResolver.resolveAddrInfos(PunchnetConfig.server).first {
             options["super_ip"] = ip as NSObject
+        } else {
+            throw PunchnetError.dnsUnreachable
         }
         
         return options
diff --git a/punchnet/VPNManager.swift b/punchnet/VPNManager.swift
index b8d61ca..d905fab 100644
--- a/punchnet/VPNManager.swift
+++ b/punchnet/VPNManager.swift
@@ -32,7 +32,7 @@ class VPNManager: ObservableObject {
         try await manager.loadFromPreferences()
         self.addVPNStatusObserver(manager)
         
-        var configOptions = PunchnetConfig.getOptions()
+        var configOptions = try PunchnetConfig.getOptions()
         configOptions.merge(options, uniquingKeysWith: {$1})
         
         try manager.connection.startVPNTunnel(options: configOptions)