502 Bad Gateway for Laravel 5.4 with nginx and php7.0-fpm in Ubuntu

I have my Laravel 5.4 app setup in Ubuntu 16.04 server with nginx and php7.0-fpm, it gives

502 Bad Gateway

Nginx virtualhost config,

server {    listen   80; ## listen for ipv4; this line is default and implied    #listen   [::]:80 default ipv6only=on; ## listen for ipv6    root /var/www/html/laravel/public;    index index.php index.html;    # Make site accessible from http://localhost/    server_name localhost;    location / {        try_files $uri $uri/ /index.php?$query_string;    }    location ~ \.php$ {        try_files $uri /index.php =404;        include                  fastcgi_params;        fastcgi_keep_conn on;        fastcgi_index            index.php;        fastcgi_split_path_info  ^(.+\.php)(/.+)$;        fastcgi_param PATH_INFO $fastcgi_path_info;        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;        fastcgi_intercept_errors on;        fastcgi_pass unix:/var/run/php7.0-fpm.sock;    }}

Tried the following but still not working,

Changed fastcgi_pass unix:/var/run/php7.0-fpm.sock; to fastcgi_pass 127.0.0.1:9000;

Changed try_files $uri $uri/ /index.php?$query_string; to try_files $uri $uri/ /index.php$is_args$args;

Restarted service after each change,

service nginx restartservice php7.0-fpm restart

I can access only the main route with this config,

server {        listen   80; ## listen for ipv4; this line is default and implied        #listen   [::]:80 default ipv6only=on; ## listen for ipv6        root /var/www/html/laravel/public;        index index.html index.htm index.php;        # Make site accessible from http://localhost/        server_name localhost;        location / {                try_files $uri $uri/ =404;        }        location ~ \.php$ {                include snippets/fastcgi-php.conf;                fastcgi_pass unix:/run/php/php7.0-fpm.sock;        }        location ~ /\.ht {                deny all;        }}