The server closed the network connection because it waited too long for data from the client, triggering ER_NET_READ_INTERRUPTED (error 1159).
MySQL Error 1159: ER_NET_READ_INTERRUPTED occurs when the server times out while reading packets from a client. Increase net_read_timeout, optimize long-running queries, and check network latency to resolve the issue.
Got timeout reading communication packets
Error 1159 appears when the MySQL server abandons a client connection after waiting longer than net_read_timeout for incoming data. The server logs Got timeout reading communication packets and returns SQLSTATE 08S01.
The issue signals a broken or stalled connection, often during large result transfers, slow networks, or blocking application logic. Fixing it quickly prevents aborted transactions and application errors.
Most cases trace back to network or configuration limits.
Low net_read_timeout, high latency, large BLOB transfers, or firewalls that cut idle TCP sessions interrupt the data flow.
Long-running server functions, locks, or unindexed queries can also delay packet delivery enough to exceed the timeout window.
Raise net_read_timeout to a value that matches your workload latency, then retest. Tune queries for faster response, batch large transfers, and ensure client libraries stream data efficiently.
Inspect network gear for idle session limits.
Enable TCP keep-alive or VPN acceleration to stabilize long connections.
Bulk export utilities often hit 1159 mid-transfer. Reconfigure them to split files or raise timeouts. Web apps behind load balancers see the error when idle timeouts differ between tiers. Align all tiers to the longest expected query time.
Cloud VMs with packet loss suffer intermittent 1159.
Monitor with ping and traceroute, then migrate to a zone with lower RTT.
Always keep net_read_timeout and net_write_timeout slightly above peak query duration. Instrument queries in Galaxy’s query history to detect slow patterns early.
Use connection pools with automatic retries, and stream large result sets instead of buffering them all at once.
Error 2013 Lost connection to MySQL server during query arises from similar timeouts but while sending results.
Apply the same tuning approach.
Error 1040 Too many connections differs because it limits concurrent sessions, not packet timing. Scale the max_connections value to fix.
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No. The variable only controls how long the server waits; it does not allocate additional buffers.
Sometimes. Retrying queries, streaming reads, and enabling keep-alive may solve the problem without server changes.
Galaxy’s editor surfaces query runtime metrics, so slow statements that risk 1159 are visible and fixable before deployment.
Not usually. Timeouts are configurable on all supported versions; upgrade only if you need newer connection features.
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