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Hi, we are currently implementing below method for a quick POC in iOS (Xcode 15.3/macOS Sonoma 14.0): func startQUICConnection() async { // Set the initial stream to bidirectional. options.direction = .bidirectional self.mainConn?.stateUpdateHandler = { [weak self] state in print("Main Connection State: \(state)") switch state { case .ready: print("Ready...") default: break } } // Don't forget to start the connection. self.mainConn?.start(queue: self.queue) } This is what we have in the initializer of the class: parameters = NWParameters(quic: options) mainConn = NWConnection(to: endpoint, using: parameters) These are the class's properties: let endpoint = NWEndpoint.hostPort(host: "0.0.0.0", port: .init(integerLiteral: 6667)) let options = NWProtocolQUIC.Options(alpn: ["echo"]) let queue = DispatchQueue(label: "quic", qos: .userInteractive) var mainConn: NWConnection? = nil let parameters: NWParameters! As per the logs, we never get to the .ready state for the NWConnection. Logs: nw_path_evaluator_create_flow_inner failed NECP_CLIENT_ACTION_ADD_FLOW (null) evaluator parameters: quic, attach protocol listener, attribution: developer, context: Default Network Context (private), proc: 022B7C28-0271-3628-8E5E-26B590B50E5B nw_path_evaluator_create_flow_inner NECP_CLIENT_ACTION_ADD_FLOW 8FEBF750-979D-437F-B4A8-FB71F4C5A882 [22: Invalid argument] nw_endpoint_flow_setup_channel [C2 0.0.0.0:6667 in_progress channel-flow (satisfied (Path is satisfied), interface: en0[802.11], ipv4, ipv6, dns, uses wifi)] failed to request add nexus flow Main Connection State: preparing Main Connection State: waiting(POSIXErrorCode(rawValue: 22): Invalid argument) We're running a local server using proxygen on port 6667. It connects with the proxygen client though... Have tried several thing but results are the same.