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What is the meaning of the "connection reset by peer" error on a TCP connection? Is it a fatal error or just a notification or related to the network failure?
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The error message "Connection reset by peer" appears, if the web services client was waiting for a SOAP response from the remote web services provider and the connection was closed prematurely. One of the most common causes for this error is a firewall in the middle closing the connection.
An application gets a connection reset by peer error when it has an established TCP connection with a peer across the network, and that peer unexpectedly closes the connection on the far end.
Summary. If you run into the “ERR_CONNECTION_RESET” error, it means that your browser can't establish a connection to the remote server. In most cases, it's due to a misconfiguration in your internet settings or something else that's blocking the connection.
It's fatal. The remote server has sent you a RST packet, which indicates an immediate dropping of the connection, rather than the usual handshake. This bypasses the normal half-closed state transition. I like this description:
"Connection reset by peer" is the TCP/IP equivalent of slamming the phone back on the hook. It's more polite than merely not replying, leaving one hanging. But it's not the FIN-ACK expected of the truly polite TCP/IP converseur.
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This means that a TCP RST was received and the connection is now closed. This occurs when a packet is sent from your end of the connection but the other end does not recognize the connection; it will send back a packet with the RST bit set in order to forcibly close the connection.
This can happen if the other side crashes and then comes back up or if it calls close() on the socket while there is data from you in transit, and is an indication to you that some of the data that you previously sent may not have been received.
It is up to you whether that is an error; if the information you were sending was only for the benefit of the remote client then it may not matter that any final data may have been lost. However you should close the socket and free up any other resources associated with the connection.
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