Usually it means that the other host has received your connection attempt and is actively refusing your TCP connection, but sometimes an intervening firewall may block your TCP SYN packet and send a TCP RST back to you. 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.
#Connection refused host requires authentication qownnotes code
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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