Thanks for your post.

I did the following changes, but I'm still getting this error. Note that it is a local environment and I'm barely having 10 requests per second. Probably I didn't get your point and circling around myself. I created 4 more server blocks listening for 8000 to 8003 ports. I tried it without them and I couldn't open any page so I tried this one:

http {
include mime.types;
default_type application/octet-stream;

sendfile off;

keepalive_timeout 0;

upstream myproject {
server 127.0.0.1:8000 weight=3;
server 127.0.0.1:8001;
server 127.0.0.1:8002;
server 127.0.0.1:8003;
}

server
{
listen 3334;

server_name localhost;
root E:/emergency/HTML/;

location / {
autoindex on;
proxy_pass http://myproject;
}

}

server
{
listen 8000;

server_name localhost;
root E:/emergency/HTML/;

error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}

location ~ \.php$ {

fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param PHP_FCGI_MAX_REQUESTS 0;
fastcgi_param PHP_FCGI_CHILDREN 100;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}
server
{
listen 8001;

server_name localhost;
root E:/emergency/HTML/;

error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}

location ~ \.php$ {

fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param PHP_FCGI_MAX_REQUESTS 0;
fastcgi_param PHP_FCGI_CHILDREN 100;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}
server
{
listen 8002;

server_name localhost;
root E:/emergency/HTML/;

error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}

location ~ \.php$ {

fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param PHP_FCGI_MAX_REQUESTS 0;
fastcgi_param PHP_FCGI_CHILDREN 100;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}
server
{
listen 8003;

server_name localhost;
root E:/emergency/HTML/;

error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}

location ~ \.php$ {

fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param PHP_FCGI_MAX_REQUESTS 0;
fastcgi_param PHP_FCGI_CHILDREN 100;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}
}