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forums › forums › SQLyog › SQLyog: Bugs / Feature Requests › Connection goes stale
You can probably increase the wait_timeout value for the server. More information on Server System Variables can be found at http://dev.mysql.com/doc/mysql/en/Server_s…_variables.html.
Later version's of SQLyog will have an option where it will ping the MySQL server at regular intervals so that the connection is not timed out.