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i am using the network extension to connecting my ikev2 serverbut it always disconnect from server after I call the startVPNTunnal function , and the last connection error information shows like below_lastDisconnectError NSError * domain: NEVPNConnectionErrorDomainPlugin- code: 7 0x0000000283a5da70my code is like thisfileprivatefunc connect() { DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Double(Int64(1 * NSEC_PER_SEC)) / Double(NSEC_PER_SEC)) { self.vpnManager.loadFromPreferences { (error) in if let error = error { print(error.localizedDescription) self.delegate?.vpnConnectionStatusDidChanged(manager: self, status: .invalid) return } do { try self.vpnManager.connection.startVPNTunnel() print("success") } catch let error{ print("failed: " + error.localizedDescription) self.delegate?.vpnConnectionStatusDidChanged(manager: self, status: .disconnected) } } } } func savePassword(_ password: String, inKeychainItem: Data?) -> Data? { guard let passwordData = password.data(using: String.Encoding.utf8, allowLossyConversion: false) else { return nil } var status = errSecSuccess if let persistentReference = inKeychainItem { // A persistent reference was given, update the corresponding keychain item. let query: [NSObject: AnyObject] = [ kSecValuePersistentRef : persistentReference as AnyObject, kSecReturnAttributes : kCFBooleanTrue ] var result: AnyObject? // Get the current attributes for the item. status = SecItemCopyMatching(query as CFDictionary, &result) if let attributes = result as? [NSObject: AnyObject] , status == errSecSuccess { // Update the attributes with the new data. var updateQuery = [NSObject: AnyObject]() updateQuery[kSecClass] = kSecClassGenericPassword updateQuery[kSecAttrService] = attributes[kSecAttrService] var newAttributes = attributes newAttributes[kSecValueData] = passwordData as AnyObject? status = SecItemUpdate(updateQuery as CFDictionary, newAttributes as CFDictionary) if status == errSecSuccess { return persistentReference } } } if inKeychainItem == nil || status != errSecSuccess { // No persistent reference was provided, or the update failed. Add a new keychain item. let attributes: [NSObject: AnyObject] = [ kSecAttrService : UUID().uuidString as AnyObject, kSecValueData : passwordData as AnyObject, kSecAttrAccessible : kSecAttrAccessibleAlways, kSecClass : kSecClassGenericPassword, kSecReturnPersistentRef : kCFBooleanTrue ] var result: AnyObject? status = SecItemAdd(attributes as CFDictionary, &result) if let newPersistentReference = result as? Data , status == errSecSuccess { return newPersistentReference } } return nil } func connect(vpn_protocol:SGVPNProtocol, ip: String, username: String, password: String, psk: String) { vpnManager.loadFromPreferences { (error) in if error != nil { print("Load error: \(error?.localizedDescription as String?)") return } else { let configuration = NEVPNProtocolIKEv2() configuration.username = username configuration.passwordReference = self.savePassword(password, inKeychainItem: nil) configuration.authenticationMethod = .none configuration.useExtendedAuthentication = true configuration.disconnectOnSleep = false configuration.serverAddress = ip configuration.remoteIdentifier = ip configuration.localIdentifier = "" self.vpnManager.protocolConfiguration = configuration self.vpnManager.localizedDescription = "xxxx" self.vpnManager.isEnabled = true self.vpnManager.isOnDemandEnabled = false self.vpnManager.saveToPreferences(completionHandler: { (error) in if error != nil { print(error!.localizedDescription) self.delegate?.vpnConnectionStatusDidChanged(manager: self, status: SGVPNStatus.invalid) return } self.vpnManager.loadFromPreferences(completionHandler: { error in self.connect() }) }) } } }error information:Printing description of self.vpnManager._connection->_lastDisconnectError:Error Domain=NEVPNConnectionErrorDomainPlugin Code=7 "The VPN session failed because an internal error occurred." UserInfo={NSLocalizedDescription=The VPN session failed because an internal error occurred.}(lldb) i have done the capacities setting for Personer VPN and Network Extension