Usually, the error "530 Login authentication failed" shows up when the hostname or IP, username, and password you typed in your FTP client is wrong. Please make sure the hostname or IP, username, and password are correct.
If you are certain everything is correct, depending on your keyboard layout, the FTP server or FTP client might not recognize correctly some special characters. If you think that could be the case, try to change your password.
After changing your password, and you are certain the password is being inserted correctly on your FTP client, try to the use the IP address of the server instead of the hostname.