Does application server and proxy server configuration interrupt nginx to serve as web server ?

In my server I have hosted many sites with nginx as well I have configure one of the nginx configuration to serve application in centos with proxy in the same server. now while i try to host new site with subdomain that is being served by the same nginx , the site doesnot get hit via any browser but while i do ping it hits the dedicated ip of the droplets, I searched every logs but there’s no singe sign of any errors even every service are running smoothly. other sites hosted are also running smoothly. Any suggestion or idea how could i solve this ?