Lastly we moved our website billrun.net to Amazon and after configure Joomla, Nginx and MySQL, we received “Error displaying the error page: Application Instantiation Error” from Joomla.
It's not the first time we received that and each time we just give try in different configurations in the server. This time we've debugged this and found the next error: “Connect Error (1129) Host 'ip-x-x-x-x.eu-west-1.compute.internal' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'”. Pretty funny message from MySQL but let's fix it easily by running the next command from our MySQL server:
# mysqladmin -u root -p flush-hosts
After flushing applied our website succeed and our website is alive under Amazon AWS EC2.