RST is a bit on the TCP packet which indicates that the connection should be reset. Then you received a TCP RST packet in reply.You sent a TCP SYN packet to the other host.If you try to open a TCP connection to another host and see the error 'Connection refused,' it means that They both use the same generic error code. Unfortunately, there is no way to differentiate between 'the port is not open at all' and 'the port is open but too busy right now'. Wait a moment or so and try the connection again. The server code has not called accept() enough times yet to finish clearing out available slots for new queue items. There is another reason that has not been mentioned yet - the listening port is actually open and actively being used, but its backlog of queued inbound connection requests has reached its maximum so there is no room available for the inbound connection request to be queued at that moment. One reason has already been mentioned several times - the listening port being connected to is not open.

The error means the OS of the listening socket recognized the inbound connection request but chose to intentionally reject it.Īssuming an intermediate firewall is not getting in the way, there are only two reasons (that I know of) for the OS to reject an inbound connection request.

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