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This error comes from the MySQL database, it indicates that the database transaction takes longer than the default timeout value of MySQL transactions.

The database queries that Diafaan SMS Server send to the MySQL database are not very complex, normally they should not trigger this error. The most likely explanation for this error is that the number of records in one of the database tables is getting too large, it might be necessary to remove records or move records to another database table.

If you have changed the 'MaximumBatchSize' property of the SQL Connector to a very high value then this could also cause the error. It is best to leave this value to the default of 500.

Regards, Henk