PHP-FPM Error on NGINX (502 Bad Gateway)

I am getting the following error on error log for my LEMP Ubuntu 20.04 setup on NGINX

704#704: *58 connect() failed (111: Connection refused) while connecting to upstream, client: xx.xx.xx.xx server: domain.tld, request: "GET /favicon.ico HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "domain.tld"

My domain configuration is as follows listed under /etc/nginx/conf.d/domain.conf

        server_name domain.tld;
        root /var/www/domain/;

        index index.html index.php;

        access_log /sites/domain/logs/access.log;
        error_log /sites/domain/logs/error.log;

        # Don't allow pages to be rendered in an iframe on external domains.
        add_header X-Frame-Options "SAMEORIGIN";

        # MIME sniffing prevention
        add_header X-Content-Type-Options "nosniff";

        # Enable cross-site scripting filter in supported browsers.
        add_header X-Xss-Protection "1; mode=block";

        # Prevent access to hidden files
        location ~* /\.(?!well-known\/) {
                deny all;
        }

        # Prevent access to certain file extensions
        location ~\.(ini|log|conf)$ {
                deny all;
        }

        # Enable WordPress Permananent Links
        location / {
                try_files $uri $uri/ /index.php?$args;
        }

        location ~ \.php$ {
        include /etc/nginx/fastcgi_params;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        }

}

configuration under /etc/nginx/sites-available/ is attached

server {
    listen 80;
    listen [::]:80;
    root /var/www/csgg;
    index i index.php index.html index.htm;
    #server_name  csgg.in;

    client_max_body_size 100M;
    autoindex off;
    location / {
        try_files $uri $uri/ /index.php?$args;
    }

    location ~ \.php$ {
         include snippets/fastcgi-php.conf;
         fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
         fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
         include fastcgi_params;
    }
}

Can someone shed some light on how to get PHP-FPM to start behaving normally? I am able to access .txt and .HTML files in the root folder.