I can\'t connect to the cPanel, even by FTP

[valbox37]

By cPanel : Server can\'t be found
By FTP : Error 530 (incorrect login)

Please help me ! The server used to work before but since yesterday I\'ve got this problem.

 

[valbox37]

Now I can to log in to the cPanel, but my FTP client says me "421 Error: The server closed the connection"