Error 1156 signals that MySQL received TCP packets in the wrong sequence, terminating the session to prevent protocol corruption.
MySQL Error 1156: ER_NET_PACKETS_OUT_OF_ORDER happens when client and server receive packets out of sequence, usually after a network glitch or protocol mismatch. Reconnect, upgrade the MySQL client, and tune net_buffer_length to fix the issue.
Got packets out of order
MySQL raises error 1156 when the protocol layer detects packets arriving with unexpected sequence numbers. The server closes the socket and reports “Got packets out of order” with SQLSTATE 08S01, classifying the event as a communications link failure.
This interruption cancels the current statement, discards buffered results, and forces applications to reconnect before sending additional SQL.
Ignoring the error can break batch jobs, ETL pipelines, and live services that depend on uninterrupted streams.
Network latency, packet loss, or proxies that reshuffle TCP fragments frequently desynchronize MySQL’s packet counter, triggering error 1156.
Old client libraries that violate the protocol and mismatched client-server versions also corrupt packet ordering.
Very large result sets or BLOB transfers pushed through small net_buffer_length sizes cause fragmentation, increasing the chance of reordering on congested links.
Restart the connection immediately because MySQL will not resynchronize an out-of-order stream. Upgrade both client and server to supported, matching versions to remove protocol bugs.
Tune net_buffer_length, max_allowed_packet, net_read_timeout, and net_write_timeout to values that fit your workload and network quality.
When a proxy is involved, enable TCP proxy protocol mode or round-robin session pinning to ensure packets remain in order between client and server.
Remote backups over a high-latency VPN can throw error 1156 mid-stream. Compress the dump or replicate with binlog to reduce packet count.
Large analytics SELECT queries executed from an old Connector/J often fail; upgrading the driver and enabling reconnect=true resolves it.
Container orchestrators that reuse sockets across pods send stray bytes at startup, confusing the server. Clearing the connection pool on container restart avoids the stray data and the resulting packet disorder.
Maintain version parity between client libraries and the MySQL server. Monitor aborted_connects, error 1156 counts, and network RTT with Performance Schema or Galaxy query logs.
Keep net_buffer_length reasonably large (16k–64k) and ensure load balancers forward packets transparently without buffering.
In Galaxy, set workspace alerts on error 1156 occurrences so teams can inspect failing queries and tune parameters before the issue scales.
Error 2013 “Lost connection to MySQL server during query” signals a timeout rather than wrong sequencing. Increase timeouts and optimize queries to fix 2013.
Error 1040 “Too many connections” is resource-related; scaling the instance prevents both 1040 and follow-on 1156 events caused by sudden reconnect storms.
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Packet loss or reordering on the network path changes the expected sequence identifier and forces MySQL to abort.
Older MySQL connectors occasionally send duplicate packets or skip sequence ids, creating protocol violations.
Middleboxes that buffer or coalesce packets can deliver them out of application order, confusing the server.
Gigabyte-scale SELECTs fragment into thousands of packets, multiplying the risk of reordering across congested links.
Feature differences between major versions can alter packet framing, making sequences incompatible.
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Large result sets split into many protocol packets, raising the chance that congested links reorder them. Increasing net_buffer_length and using compression reduces fragmentation.
Bumping max_allowed_packet helps only if fragmentation caused packet disorder. It does not fix client-side protocol bugs or proxy issues.
Either side can be at fault. The server merely notices the disorder. Check client driver versions, proxy settings, and network health.
Galaxy logs connection errors per query, highlights rising 1156 counts, and suggests buffer and timeout adjustments in its AI copilot.
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