curl Exit Code 56 in CI: Failure Receiving Network Data
curl exit code 56 means a failure while receiving data - the connection was reset or dropped mid-transfer.
A step exiting 56 from curl started receiving a response but the connection broke before it finished.
What it means
Exit 56 is curl's CURLE_RECV_ERROR. A network receive failed - typically "connection reset by peer" from the server, a proxy, or the network dropping the stream.
Common causes
- The server reset the connection (RST) mid-response.
- A proxy/firewall idle-timeout closed the stream.
- Network instability or packet loss.
How to fix it
Add --retry for resilience and check proxy/idle-timeout settings. Connection resets are usually transient infrastructure failures - Latchkey auto-retries this mechanical class rather than failing the run.
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