MySQL ERROR 1129 (HY000): “Host is Blocked” — How to Fix It

MySQL ERROR 1129 (HY000): “Host is Blocked

If you’re encountering the MySQL ERROR 1129 (HY000): Host is blocked because of many connection errors.

This defect is a common issue caused by failed connection attempts from a specific host. MySQL tracks failed connection attempts from each host. If the number exceeds the value of the max_connect_errors variable, MySQL will block the host from making further connections. This function acts as a security mechanism to prevent potential brute-force attacks or misbehaving clients.

Facing ERROR 1129 (HY000) Host is Blocked? Learn how to quickly identify the cause and fix the issue with step-by-step guidance.

You may see this error due to

• A script or app repeatedly trying to connect with incorrect credentials
• Misconfigured clients sending too many requests too fast
• A cron job or background service using outdated login info
• Suspicious activity or brute-force attempts from external IPs

Solutions to Fix the MySQL ERROR 1129

1. Flush the Host Cache

This unblocks the host immediately.

From the command line:

mysqladmin -u root -p flush-hosts

From the MySQL shell:

FLUSH HOSTS;

2. Increase the max_connect_errors Limit

If your application occasionally misbehaves, increasing this value can prevent automatic blocks.

Temporarily (no restart needed):

SET GLOBAL max_connect_errors = 10000;

Permanently (edit config):
Edit my.cnf and add

[mysqld]
max_connect_errors = 10000

Then restart MySQL service

sudo systemctl restart mysql

For AWS RDS users: you will need to modify the DB parameter group in the AWS console.

While MySQL’s ERROR 1129 can seem alarming, it’s actually protecting your system from excessive failed connections. By following the steps above, you can quickly unblock the host and prevent future issues.

If you’re still facing this issue MySQL ERROR 1129 (HY000) Host is Blocked, it’s time to get expert assistance. We specialize in resolving complex MySQL errors and offer reliable server management services to ensure your systems run smoothly and securely. Don’t let connection issues disrupt your operations—reach out to our 24/7 support team for fast, professional help.