Xử lý lỗi "2006 MySQL server has gone away" của navicat

You should increase the 'max_allowed_packet' and 'wait_timeout' values for your target server.
In menu, choose Tools > Server Monitor

1. check the box for the target server which you employ data transfer
2. click the tab "Variables"
3. scroll down and find the variable 'max_allowed_packet' and 'wait_timeout'
4. click the "..." button
5. enter a larger value as variable value and press OK