1743
MySQLERRORCommonReplicationHIGH confidence
Network read event checksum failure
Production Risk
Critical — replicated data may be corrupt.
What this means
A binlog event received over the network from the master had a checksum mismatch, indicating data corruption in transit.
Why it happens
- 1Network packet corruption between master and replica.
- 2Master and replica have mismatched binlog_checksum settings.
How to reproduce
trigger — this will error
trigger — this will error
-- Occurs automatically during replication; not directly triggerable via SQL
expected output
ERROR 1743 (HY000): Replication event checksum verification failed while reading from network.
Fix 1
Ensure matching binlog_checksum on master and replica
Ensure matching binlog_checksum on master and replica
SET GLOBAL binlog_checksum = 'CRC32'; -- on both master and replica
Why this works
Consistent checksum algorithm prevents verification failures.
Fix 2
Investigate network path for packet corruption
Investigate network path for packet corruption
-- Check network hardware, switches, and cables
Why this works
Eliminates hardware-level corruption source.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 1743 ER_NETWORK_READ_EVENT_CHECKSUM_FAILURE
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