Vesta Control Panel - Forum

The logs show reverse lookup for IP addresses. It is not something to worry about. You can turn off by adding below lines to /etc/my.cnf and restarting mysql service.

skip-host-cache
skip-name-resolve

Actual Free Memory = Free (571 MB) + Buffers/Cached (1892 MB) = 2,463 MB

Try adding server_name directive before return :

server {
listen 80;
listen 443;
server_name IP_ADDRESS;
return 403;
}