When you server is brute force cracked successfully, malicious attackers may already intrude and log on your server, and upload malicious programs to your server. Thus, we recommend that you follow these steps to reinforce the security of your server:
Step 1: Change the password
Change the password of the user that was brute force cracked on the server. We recommend that you use a complex password.
Step 2: Restore and reinforce your server
To reinforce your server, see ECS security deployment method.