MySQL 1159: Communication error.

What is MySQL 1159: Communication error.

Check Network Connectivity: Ensure that the machine you are working from can reach the MySQL server. You can use `ping ` to check the connectivity.

Verify MySQL Server Status: Use `mysqladmin -h -u -p status` to check if the MySQL server is running. Replace ``, `` with actual server IP and user.

Check Firewall Settings: Ensure that no firewall is blocking the communication between your machine and the MySQL server. If you have access, use `sudo ufw status` on the server (for Unix systems) to see if the firewall is active and if the MySQL port (default is 3306) is open.

Examine MySQL Server Logs: If possible, check the MySQL server logs for any related errors. The logs can be found in the MySQL data directory, often located at `/var/log/mysql` or `/var/lib/mysql`. Look for entries around the time the error occurred using `tail -n 100 /var/log/mysql/error.log`.

Increase Connection Timeout: Temporarily increase the `netreadtimeout` and `connect_timeout` values on the client side to see if it resolves the issue. Connect to MySQL and run:

SET GLOBAL netreadtimeout=120; SET GLOBAL connect_timeout=120; This increases the timeout values to 120 seconds, adjust the values based on your needs.

Check MySQL Server Load: Use `SHOW PROCESSLIST;` to check if there are too many connections or long-running queries that could be causing the server to be unresponsive.

Verify MySQL User Permissions: Ensure the user has the correct permissions and isn't restricted from connecting from your IP. You can verify this by connecting to MySQL from a different machine or network, if possible.

Restart MySQL Service: If you have the permission and it's safe to do so, try restarting the MySQL service on the server with `sudo systemctl restart mysql` on Linux systems.

These actions are immediate steps you can take to investigate and potentially resolve the error 1159: Communication error in MySQL.