Change your password
In case your website is down or has other unusual performance issues, the first thing you should try is changing your account password for the website in the content management system (CMS) interface, such as for example WordPress.
When heavy cyber incidents occur, it is also advised to change the server password. This can be achieved in different ways depending on the type of the server ,such as Windows Server or Linux.
Use SHA key authentication
For additional security, it is highly recommended to use SHA key authentication, i.e. setting up SSH (Secure Shell) [SHH] on your server. SSH is a popular software package which enables secure system administration and file transfers over insecure networks, meaning that it uses encryption to secure the connection between a client and a server. All user authentication, [AUTENTIFICATION] commands, output and file transfers are therefore protected from attacks in the network.
All details about implementation and configuration can be found on the SSH official website.
Error Server Site Password