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It probably is seeing the arriving connection but with your resolve Remote address (T) left unwired it will start a DNS query to resolve the assiciated IP address to a domain name and if your DNS setup is not up to snuff that can hang until it eventually will timeout. And that timeout for the DNS resolution is unfortunately not timeout controllable by the caller but inherent in the socket library. Do you need a domain name or is the IP address enough? Try to set this input to false and see then. The Wait for Listener is NOT waiting for any data to arrive on the incoming connection. It accepts() the connection, which sends the ack and then because you told it to resolve the remote address does start a DNS resolution inquiry for the IP address and that is where it hangs for you. It of course can only return after the DNS resolution has returned control to the routine, successful or not. The data your remote side sends will have to be handled by a TCP Read that gets the refnum returned from Wait for Listener.