MYSQL

# Default 100 if you access this limit you will be blocked
SHOW VARIABLES LIKE 'max_connect_errors';
+--------------------+-------+
| Variable_name      | Value |
+--------------------+-------+
| max_connect_errors | 100 |
+--------------------+-------+
1 row in set (0.00 sec)

# increase the limits (think about what you done)
SET GLOBAL max_connect_errors=10000;