MySQL throws EE_PACKETS_OUT_OF_ORDER when the sequence number of protocol packets received from or sent to the server is not in the expected order.
MySQL Error 62: EE_PACKETS_OUT_OF_ORDER occurs when client and server packets arrive in the wrong sequence. Upgrade your MySQL connector, dedicate one thread per connection, and check proxies or load balancers to restore proper packet order.
Packets out of order (found %u, expected %u). EE_PACKETS_OUT_OF_ORDER was added in 8.0.13.
The error appears with the message "Packets out of order (found %u, expected %u)" when the MySQL client detects that the next packet’s sequence ID is not the expected value. MySQL 8.0.13 introduced this global error to surface protocol desynchronization clearly.
Packet order matters because each client–server exchange relies on monotonically increasing sequence IDs (0–255).
A mismatch signals data corruption, driver bugs, concurrency misuse, or network interference, and MySQL terminates the connection to protect data integrity.
The error usually shows up immediately after a query is sent or a result set is read.
It is common in high-throughput applications using connection pools, multithreaded access on a single connection, outdated client libraries, or TLS-terminating proxies that mangle packets.
Because the connection is closed, every in-flight transaction rolls back, making fast diagnosis and recovery critical in production.
Concurrent threads sharing one connection can interleave reads and writes, scrambling packet order.
Old MySQL client libraries or third-party drivers may generate packets with an incorrect sequence counter.
Middleboxes such as proxies, firewalls, or VPNs sometimes buffer and replay packets out of order. Rarely, kernel or NIC offloading issues reorder small TCP segments, leading to a protocol-level mismatch.
First, upgrade the MySQL client or connector to match the server version. Next, ensure each connection is owned by exactly one thread at a time.
If you use a pool, borrow and return connections properly.
Check any proxy, load balancer, or SSL terminator in the path. Disable experimental packet-coalescing or multiplexing features.
If corruption is suspected, run RESET CONNECTION or reconnect entirely.
JDBC application on MySQL 8.0.13+ - Update the MySQL Connector/J to 8.0.33 or later, then redeploy.
PHP-FPM with persistent connections - Turn off mysqli.reuse_connection or serialize queries per connection.
ProxySQL in front of MySQL - Upgrade ProxySQL to 2.5+, verify mysql-auto_increment_delay_msec is default, and monitor for dropped packets.
Pin connector and server versions, run integration tests after every upgrade, and enforce single-threaded access per connection.
Enable MySQL’s performance schema to catch aborted connections and track error 62 frequency.
Implement connection health checks in your application. Galaxy’s SQL editor automatically opens a fresh, single-owner session for every query, eliminating cross-thread packet issues during interactive work.
CR_SERVER_LOST - Indicates the TCP connection dropped entirely rather than a sequence mismatch. Investigate network stability.
ER_NET_PACKET_TOO_LARGE - Triggered when a packet exceeds max_allowed_packet; adjust the variable or chunk large inserts.
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No. It indicates a protocol mismatch, but MySQL aborts the transaction before corruption occurs.
Ignoring it risks silent data loss if the root cause worsens. Investigate and patch immediately.
Yes. RESET CONNECTION clears session state without closing the TCP socket, making it pool-friendly.
Galaxy opens a fresh, isolated connection per query in its editor, ensuring single-threaded access and correct packet sequencing.
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