Multiple reactapp using docker - docker

Question

When i try to run mutiple reactapps using docker and nginx reverse proxy, iam getting an error : Upstream timed out while connecting to the upstream.
The error you can see in the below screenshot when i check the nginx logs
server {
listen 80;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl default_server;
listen [::]:443 ssl default_server;
add_header 'Cache-Control' "public, max-age=31536000";
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
add_header X-Frame-Options "SAMEORIGIN";
add_header X-XSS-Protection "1; mode=block";
add_header X-Content-Type-Options: "nosniff";
ssl_certificate /etc/nginx/conf.d/cert.crt;
ssl_certificate_key /etc/nginx/conf.d/ssl.key;
server_name <Domain-ip>;
location / {
proxy_pass http://domainname:3000;
#try_files $uri /index.html;
}
location /elderly {
proxy_pass http://domainname:3001;
#try_files $uri /index.html;
}
location /carer {
proxy_pass http://domainname:3002;
#try_files $uri /index.html;
}
#For gzip text compression
gzip on;
gzip_comp_level 2;
gzip_min_length 1000;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain application/x-javascript text/xml text/css application/xml application/javascript
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}
#For optimization
location ~* \.(ico|css|js|webp|gif|jpeg|jpg|png|woff|ttf|otf|svg|woff2|eot)$ {
expires 365d;
add_header Cache-Control "public, max-age=31536000";
}
}