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By default, MySQL server terminates a client connection after 28800 seconds of inactivity. Often database administrators change this value to a lower number. This results in a broken connection if the user does not submit any query for a long period of time.
Type the following query to see what the current setting is for this variable.
SHOW VARIABLES like 'interactive_timeout'
In addition to 'interactive_timeout', you might also want to check the value for 'wait_timeout. Refer to MySQL documentation for a detailed description of these parameters.
To set a new value for these parameters, you can use the SET command. For example:
SET interactive_timeout=32000
IMPORTANT: There is no configuration setting in WinSQL (the
client) that automatically terminates a connection. Therefore, the only
way to fix this problem is to change the configuration parameter on the
server.