yes, you are right to say that user [email protected] does not exist as I can't find it in the system, I only got user root@localhost. But I have other system with the same type of pc & setup do not have this issue. So, I believe that somebody may have change the configuration somewhere but I am not sure where it is. Of course, I can solve this by re-install mysql & webyog but the problem may come back again. If you have any solution, pls let me know. Tks.