Hello jazikh it looks as though this is related to a MySQL bug, here is one discussion https://www.percona.com/forums/questions-discussions/mysql-and-percona-server/13590-character-set-warning
Here is the bug report: [URL]MySQL Bugs: #72543: remove the spam warnings: Client failed to provide its character set
A poster on StackOverflow reported that after updating the connector the issue was resolved, might this apply here? [url]How to Disable Warning for MySQL 5.6.14 on Windows Server 2012? - Stack Overflow