FyroxEngine/Fyrox · error

An error occurred when reading data from socket

Error message

An error occurred when reading data from socket: {err}

What it means

Logged in fyrox-core net.rs when reading from the TCP socket returns an unexpected io::Error. WouldBlock and Interrupted are handled separately (ignored/retried); any other error kind is logged, the receive buffer is cleared, and receive_bytes returns. This typically means the connection was dropped or reset.

Solutions

1. Detect the closed connection and remove/disconnect the peer instead of retrying
2. Implement an application-level keep-alive/ping to detect dead connections
3. Wrap reads so ConnectionReset/UnexpectedEof are treated as graceful disconnects
4. Check network stability (firewall, NAT timeouts) for long idle sessions

Example fix

// before
Log::err(format!("An error occurred when reading data from socket: {err}"));
self.rx_buffer.clear();
// after
match err.kind() {
    ErrorKind::ConnectionReset | ErrorKind::UnexpectedEof => self.disconnect(peer),
    ErrorKind::WouldBlock | ErrorKind::Interrupted => {},
    _ => { Log::warn(format!("socket read: {err}")); self.disconnect(peer); }
}

match stream.read(&mut buf) {
    Ok(0) => disconnect(peer), // EOF
    Ok(n) => handle(n),
    Err(e) if e.kind() == ErrorKind::Interrupted || e.kind() == ErrorKind::WouldBlock => {},
    Err(e) => { Log::warn(format!("socket: {e}")); disconnect(peer); }
}

When it happens

Trigger: Peer closed the connection abruptly (ConnectionReset), network failure mid-read, socket closed unexpectedly while waiting for length-prefixed data in process_input or pop_message.

Common situations: Client kills the game process, network cable/wifi drop, server restart, NAT/firewall idle timeout, peer OS refusing the connection after crash.

Understand the failure class

Background: ECONNREFUSED and "connection refused" / "could not connect to server" errors: what they mean and how to fix them — this error's family across 44 libraries.

Related errors

• Attempt to get reference to resource data which failed to…
• Invalid path
• Failed to copy file to the folder. Reason
• Failed to copy file to the folder. Reason
• Failed to parse a network message of

AI-assisted analysis of FyroxEngine/Fyrox@76c91aad8e (2026-09-10). Data as JSON: /api/errors/25b3f80ecc2c7d8e. Report an issue: GitHub.

Appendix: source

Thrown at fyrox-core/src/net.rs:158

        loop {
            let mut bytes = [0; 8192];
            match self.stream.read(&mut bytes) {
                Ok(bytes_count) => {
                    if bytes_count == 0 {
                        break;
                    } else {
                        self.rx_buffer.extend(&bytes[..bytes_count])
                    }
                }
                Err(err) => match err.kind() {
                    ErrorKind::WouldBlock => {
                        break;
                    }
                    ErrorKind::Interrupted => {
                        // Retry
                    }
                    _ => {
                        Log::err(format!(
                            "An error occurred when reading data from socket: {err}"
                        ));

                        self.rx_buffer.clear();

                        return;
                    }
                },
            }
        }
    }

    pub fn process_input<M>(&mut self, mut func: impl FnMut(M))
    where
        M: DeserializeOwned,
    {
        self.receive_bytes();

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