Nginx welcome page

I was able to use zammad backend a few days ago but since this morning when I insert my Url I keep on getting the “Welcome to Nginx” page. Please help on this.

Check your Nginx-Config: /etc/nginx/sites-enabled/zammad.conf

Here is my working config for example (ssl-enabled):

server {
listen 80;
return 301 https://$host$request_uri;

server {
listen 443 http2 ssl;


ssl_certificate /etc/nginx/ssl/zertifikat.pem;
ssl_certificate_key /etc/nginx/ssl/server.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ecdh_curve secp384r1;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;
ssl_stapling on;
ssl_stapling_verify on;
add_header Strict-Transport-Security “max-age=63072000; includeSubdomains”;
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;