MySQL throws EE_NET_SEND_ERROR_IN_BOOTSTRAP (error 61) when the server cannot write bootstrap data to the network socket, usually because the client closed the connection or the OS blocked the send operation.
MySQL Error 61: EE_NET_SEND_ERROR_IN_BOOTSTRAP means the server failed to send bootstrap data over the network socket, often after the client disconnects or the OS exhausts buffer space. Restart the affected session, increase OS socket buffers, and verify connectivity to resolve the problem.
%d %s. EE_NET_SEND_ERROR_IN_BOOTSTRAP was added in 8.0.13.
The message indicates MySQL could not send data through a network socket while the server was in its bootstrap phase.
The write() or send() system call returned an error, so the server aborted the operation and surfaced error 61.
The error shows during initial server startup, replication cloning, or mysql_upgrade when the server is outputting bootstrap SQL statements to the client connection created by itself.
Bootstrap failures stop the server from completing initialization tasks.
Left unresolved, the instance may refuse client connections or leave the data dictionary in an inconsistent state.
Most cases involve an unexpected client disconnect or an operating-system networking limit that blocks further writes. Misconfigured firewalls and virtual machine network drops also trigger the error.
First, confirm the network path is healthy. Next, raise kernel send buffer sizes and ensure the client does not time out.
Finally, restart the bootstrap process.
On containerized deployments, short health-check intervals can disconnect the bootstrap session. Increasing the timeout prevents the error. During replication cloning, make sure the donor and recipient run compatible MySQL versions and the link is stable.
Use reliable networks, monitor socket buffer metrics, and patch MySQL to the latest 8.0 release.
Automate health checks that retry bootstrap steps only after confirming connectivity.
Galaxy’s desktop SQL editor keeps client-side connections open and retries interrupted sessions automatically. Its connection pooling reduces the chance of abrupt disconnects that generate EE_NET_SEND_ERROR_IN_BOOTSTRAP.
Errors such as ER_NET_PACKET_TOO_LARGE and ER_SERVER_SHUTDOWN share similar network roots. The troubleshooting steps for EE_NET_SEND_ERROR_IN_BOOTSTRAP also resolve these issues.
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No data is lost, but the server bootstrap may be incomplete. Rerunning bootstrap fixes state.
No. The replica may not apply required system tables. Always resolve the error.
No. Any OS can return socket write errors, but Linux defaults often expose the issue first.
Upgrading to the latest 8.0 patch often helps because networking bugs are fixed quickly.
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