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I am currently writing an agent for endpoint security. I cannot connect the application and the xpc service. I start the plist with launchctl and then open the application, but it does not connect and the application runs dysfunctionally. I leave the code of the ViewController in the application and the XPCConnection in the xpc service below. Note: I create the XPC service in Xcode like a normal application and write it as a service application with "Application is background only" ViewController.swift func establishConnection() { XPCConnection.shared.connectToDaemon(bundle: Bundle.main, delegate: self) { success in DispatchQueue.main.async { [self] in if !success { controlButton.isEnabled = false configMenuStatus(start: false, stop: false) alertWithError(error: "Unable to start monitoring for broken connection with daemon.") } else { Logger(.Info, "Connect to daemon successfully.") } } } } XPCConnection.swift func connectToDaemon(bundle: Bundle, delegate: ClientXPCProtocol, handler: @escaping (Bool) -> Void) { guard connection == nil else { Logger(.Info, "Client already connected.") handler(true) return } guard getMachServiceName(from: bundle) == ClientBundle else { handler(false) return } let newConnection = NSXPCConnection(machServiceName: DaemonBundle) newConnection.exportedObject = delegate newConnection.exportedInterface = NSXPCInterface(with: ClientXPCProtocol.self) newConnection.remoteObjectInterface = NSXPCInterface(with: DaemonXPCProtocol.self) newConnection.invalidationHandler = { self.connection = nil Logger(.Info, "Daemon disconnected.") handler(false) } newConnection.interruptionHandler = { self.connection = nil Logger(.Error, "Daemon interrupted.") handler(false) } connection = newConnection newConnection.resume() let proxy = newConnection.remoteObjectProxyWithErrorHandler { error in Logger(.Error, "Failed to connect with error [\(error)]") self.connection?.invalidate() self.connection = nil handler(false) } as? DaemonXPCProtocol proxy!.connectResponse(handler) handler(true) } This is the error photo, the application continues to work First, I checked to see if I had made a mistake in the bundle identifier, but I could not find an error, and then I realized that I had not run the launchd service. Then I ran it, but it did not make any sense. What I am trying to do is to connect and run the network extension and endpoint security with this service, but the xpc service does not connect to each other.