Today doing "Show processlist" we see the following entry in the results:

User: unauthenticated user:

along with the other entries showing root running various queries.

FYI: above IP is from China and we have been getting all sort of problem with IPs from China.

1- How do we Stop this unauthenticated user accessing our MySQL server?
2- Is this a real access to our MySQL server or something else?

Thank you for your thoughts & suggestions on this matter.