When you change Max_Allowed_Packet_Size using the command line or an admin tool, sometimes it doesnt work.#

The best way to do this is to edit the my.cnf file and add under the mysqld section the following line:

Normally it is good to set the value to around 16mb. It is only set to 1mb by default.

[mysqld]
max_allowed_packet=16MB

Restart mySQL after you have edited teh file:

On Linux:

/etc/rc.d/init.d/mysqld restart

Use services to restart

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