If you have ssh service running, make sure you disable the root login. If you didnt disable the ssh root login, you are prone to brute force attack and once it breaks in, your server is owned. To prevent this happen, you can disable the root login thru the ssh. No worry, it’s not a very difficult task, just edit a line of configuration and restart the service then you are done. 
To disable ssh root login, follow the steps below:-
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Tried to import a mysql innodb from a sql dump file, but it keep show me there is an foreign key constraint error. Due to innodb has foreign key check validation, it does not allow me to continue n show me foreign key constraint error. Ya! I know my data having some foreign key constraint problem, but what i need to do now is to import my sql dump file!