The client tries to connect with host information that the MySQL server does not recognize or allow.
MySQL Error 2009 (CR_WRONG_HOST_INFO) means the server rejected the connection because the reported host does not match its records. Check the host column in mysql.user, verify DNS or /etc/hosts entries, and reconnect after running FLUSH PRIVILEGES to fix the issue.
Wrong host info
Error 2009 raises when a MySQL client presents host details the server cannot verify. MySQL compares the incoming host name or IP to entries in the mysql.user table before authentication. A mismatch halts the handshake and returns “Wrong host info.”
The message is produced on the client side, so it may appear even when the server log shows no anomaly.
Addressing the host mismatch quickly restores connectivity and prevents unexpected downtime in production services.
Incorrect DNS or /etc/hosts mappings change the resolved name or IP, making the client’s host differ from the server’s expectation.
New network interfaces or VPN connections can alter the outbound IP, triggering a host validation failure.
Entries in mysql.user may be stale after host renaming, instance cloning, or container redeployments, so legitimate clients get blocked.
Confirm the client’s resolved hostname and IP with the shell commands `hostname` and `dig +short $(hostname)` or `ip a`.
Check the server with `SELECT user, host FROM mysql.user WHERE user='your_user';`.
Make sure the host column matches the value reported by the client.
Update or add the correct host entry, then run `FLUSH PRIVILEGES;` to apply changes instantly. Restart the client connection and verify.
Container migration often changes the container’s internal hostname. Create user accounts like `'app_user'@'%'` or update to the new container host name for resilient orchestration.
Corporate VPNs append internal domains to hostnames.
Allow wildcard sub-domains (for example `'user'@'%.corp.local'`) to cover dynamic VPN hostnames.
Cloud autoscaling may spin up replicas with new hostnames.
Automate user provisioning with IaC tools to insert matching rows in mysql.user.
Standardize host naming conventions and register them in central DNS to avoid silent hostname drift.
Use wildcard hosts (with care) for stateless application pools to minimize manual grants.
Apply automation in Galaxy’s SQL editor or CI pipelines to version-control GRANT statements and detect host drift during reviews.
Monitor MySQL connection errors with performance_schema or error logs and alert on spikes of code 2009.
CR_CONNECTION_ERROR (2002) - Cannot connect to MySQL server.
Usually network port or socket path issues. Validate host, port, and firewall.
ER_ACCESS_DENIED_ERROR (1045) - Access denied. Indicates wrong password or insufficient privileges rather than host mismatch.
CR_SERVER_GONE_ERROR (2006) - Server has gone away. Occurs after idle timeout or oversized packets; adjust wait_timeout or max_allowed_packet.
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No. Error 2009 is about host validation, while wrong credentials trigger Error 1045.
Yes for internal networks, but restrict privileges and enforce strong passwords to reduce risk.
Not usually. Running FLUSH PRIVILEGES applies changes instantly.
Galaxy versions GRANT statements, highlights host column differences during code review, and lets you run fixes in-editor without context switching.
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