Getting error on nginx 27496#27496: *2 connect() failed (111: Connection refused) while connecting to upstream, client:

Getting error on nginx 27496#27496: 2 connect() failed (111: Connection refused) while connecting to upstream, client: GET /api/onboarding//*

NGINX config file gives no error.

##
# You should look at the following URL's in order to grasp a solid understanding
# of Nginx configuration files in order to fully unleash the power of Nginx.
# http://wiki.nginx.org/Pitfalls
# http://wiki.nginx.org/QuickStart
# http://wiki.nginx.org/Configuration
#
# Generally, you will want to move this file somewhere, and start with a clean
# file but keep this around for reference. Or just disable in sites-enabled.
#
# Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.
##

# Default server configuration
#

server {
	listen 80 default_server;
	listen [::]:80 default_server;

	# SSL configuration
	#
	# listen 443 ssl default_server;
	# listen [::]:443 ssl default_server;
	#
	# Note: You should disable gzip for SSL traffic.
	# See: https://bugs.debian.org/773332
	#
	# Read up on ssl_ciphers to ensure a secure configuration.
	# See: https://bugs.debian.org/765782
	#
	# Self signed certs generated by the ssl-cert package
	# Don't use them in a production server!
	#
	# include snippets/snakeoil.conf;

	#root /var/www/html;

	# Add index.php to the list if you are using PHP
	#index index.html index.htm index.nginx-debian.html;

	server_name _;

	#location / {
		# First attempt to serve request as file, then
		# as directory, then fall back to displaying a 404.
	#	try_files $uri $uri/ =404;
	#}

	# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
	#
	#location ~ \.php$ {
	#	include snippets/fastcgi-php.conf;
	#
	#	# With php7.0-cgi alone:
	#	fastcgi_pass 127.0.0.1:9000;
	#	# With php7.0-fpm:
	#	fastcgi_pass unix:/run/php/php7.0-fpm.sock;
	#}

	# deny access to .htaccess files, if Apache's document root
	# concurs with nginx's one
	#
	#location ~ /\.ht {
	#	deny all;
	#}
		location ~ ^/(status|version|parse|train|evaluate|config|models) {
			proxy_pass http://127.0.0.1:5000;
			proxy_read_timeout 600s;
			proxy_set_header Referer "";
		}
		location /login {
			proxy_pass http://127.0.0.1:5005;
		}
		location /data {
                        proxy_pass http://127.0.0.1:7000/data;
                }

		location /api/onboarding/ {
			proxy_pass http://127.0.0.1:7000;
		}

                location /save {
                        proxy_pass http://127.0.0.1:7000/data;
                }

                location /nlu_trainer {
                        root /opt/chanakya/frontend/master/rasa-trainer/build;
                        #try_files $uri /index.html;
                }

                location / {
                        root /opt/chanakya/frontend/master/frontend/dist;
                        try_files $uri /index.html;
                        #index  index.html index.htm;
                }
}

# Virtual Host configuration for example.com
#
# You can move that to a different file under sites-available/ and symlink that
# to sites-enabled/ to enable it.
#
#server {
#	listen 80;
#	listen [::]:80;
#
#	server_name example.com;
#
#	root /var/www/example.com;
#	index index.html;
#
#	location / {
#		try_files $uri $uri/ =404;
#	}
#}