Packets out of order from client
Production Risk
High — affected connections will fail to execute queries correctly.
MySQL received a packet with an unexpected sequence number from the client. The MySQL protocol uses sequence numbers to ensure packets arrive in order; an out-of-sequence packet indicates a protocol error or network issue.
- 1Client library bug sending packets with wrong sequence numbers.
- 2Network equipment reordering TCP packets (very rare; TCP guarantees order).
- 3Client sending a command while a previous result set is still being read.
- 4Multiplexed connection proxy incorrectly interleaving packets from different sessions.
-- Observed in MySQL error log; typically caused by client protocol violation
expected output
ERROR 2040 (HY000): Got packets out of order.
Fix 1
Upgrade the client library or ORM to fix protocol compliance
-- Check for known bugs in the MySQL Connector version in use
Why this works
Updated client libraries fix known protocol sequencing bugs.
Fix 2
If using a proxy (ProxySQL, MaxScale), check for known protocol issues
-- Review proxy logs and version release notes
Why this works
Some proxy versions have known packet sequencing issues with certain query types.
✕
MySQL 8.0 — 2040 ER_NET_PACKETS_OUT_OF_ORDER
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