Considering there are no reported issues in our monitoring system, your IP address may have been blocked on the server firewall. If it's the case, it may take some time for the IP address to be removed automatically - depending on how you configured it.
Another possibility would be for your server to run out of RAM. Did you try to reboot your server?
In this particular case, we can provide better assistance if you contact our support directly. Please open a ticket in your client area if you consider it to be urgent and would like to receive priority.
