If you are seeing the error "Host 'IP' is blocked because of many connection errors" when trying to connect to a MySQL or MariaDB server, it means that the server has blocked the IP address due to too many failed connection attempts. This can be a security measure to protect the server from brute-force attacks.
To fix this error, you can try the following steps:
Check the MySQL or MariaDB error log to see if there are any clues about the cause of the connection errors. The error log is typically located in /var/log/mysql/error.log or /var/log/mariadb/mariadb.log.
Make sure that you are using the correct username and password for the MySQL or MariaDB server. If you are unsure of the correct credentials, you can check the mysql.user table or contact the server administrator.
If the connection errors are caused by a network issue or a problem with the client system, you may need to troubleshoot and fix the problem before the server will allow connections from the blocked IP address.
If you are sure that the connection errors were not caused by a problem with the client system, you can try to unblock the IP address by running the following command in the MySQL or MariaDB client:
UNBLOCK HOST 'IP';
Replace IP with the actual IP address that was blocked. This will remove the IP address from the server's blocklist.
Note: If you are unable to connect to the MySQL or MariaDB server to unblock the IP address, you may need to ask the server administrator to unblock it for you.