Troubleshooting Tips for Fixing the "ER_HOST_IS_BLOCKED: Host 'abc' has been blocked due to numerous connection errors" Issue

After conducting a speedy search on Google, I found numerous solutions to rectify this issue. However, it seems none of them offer advice on getting to the bottom of the problem. It appears that the error occurs whenever my application hits a limit on consecutive failures while trying to connect to the database. Unfortunately, I am unable to pinpoint the reasons behind these failures. Is there a method to track down the failed queries or connection attempts responsible for triggering this error? Ideally, I would like to identify whether the root cause lies in a network glitch, incorrect inputs, or some other factor.

Answer №1

Each potential root cause will be displayed in its own dedicated column within the table performance_schema.host_cache, showing the frequency of occurrence for each root cause.

To delve deeper into this issue, simply run the following query:

SELECT * FROM performance_schema.host_cache

Refer to the documentation for more information: https://dev.mysql.com/doc/mysql-perfschema-excerpt/8.0/en/host-cache-table.html

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