when I change the port from 3307 to 8666 and the service will not work now .
so ,if I want to change the port .what should I notice and which files I should modify   ?
please help.

Hi Gedeng;

I’m not sure what OS you are using;

you need to

1) stop running server
2) modify your my-ib.cnf (or my-ib.ini) file to indicate the port:

sample
other lines may be present/missing, the port= line is what you need to change

3) restart server
4) modify your client application to use the new port

tw