sockets

An existing connection was forcibly closed by the remote host

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This generally means that the remote side closed the connection (usually by sending a TCP/IP RST packet). If you’re working with a third-party application, the likely causes are: You are sending malformed data to the application (which could include sending an HTTPS request to an HTTP server) The network link between the client and server … Read more

What does “connection reset by peer” mean?

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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 … Read more