Nginx, dns – domain.com resolves but subdomain.domain.com doesn’t

I am going to pull my hair out!

I have a website domain.com with the following virtual host configuration /etc/nginx/sites-available/domain:

server {
        listen 80;
        server_name www.domain.com;
        return 301 $scheme://domain.com$request_uri;
}
server {
        listen 80;
        server_name domain.com;
        root /var/www/wordpress;
        index index.php index.html;

        location / {
                try_files $uri $uri/ /index.php?$args;
        }

        location = /favicon.ico {
                log_not_found off;
                access_log off;
        }
        location = /robots.txt {
                allow all;
                log_not_found off;
                access_log off;
        }
        location ~ /\. {
            deny all;
            access_log off;
            log_not_found off;
        }
        location ~ \.php$ {
                #NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
                include fastcgi-gen.conf;
        }
        location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
                expires max;
        }
}
server {
        listen 443 ssl;
        ssl_certificate /etc/ssl/localcerts/certificate.crt;
        ssl_certificate_key /etc/ssl/localcerts/privateKey.key;

        server_name domain.com;
        root /var/www/wordpress;

        index index.php index.html;

        location / {
                try_files $uri $uri/ /index.php?$args;
        }

        location = /favicon.ico {
                log_not_found off;
                access_log off;
        }
        location = /robots.txt {
                allow all;
                log_not_found off;
                access_log off;
        }
        location ~ /\. {
            deny all;
            access_log off;
            log_not_found off;
        }
        location ~ \.php$ {
                #NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini
                include fastcgi-gen.conf;
        }
        location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
                expires max;
                log_not_found off;
        }
}

it works great. Both domain.com and the redirection from www to non-www.
I also have this virtual host configuration /etc/nginx/sites-available/owncloud for my cloud.domain.com subdomain:

server {
        listen 80;
        server_name cloud.domain.com;
        return 301 https://$server_name$request_uri; # enforce https
}
server {
        listen 443 ssl;
        ssl_certificate /etc/ssl/localcerts/certificate.crt;
        ssl_certificate_key /etc/ssl/localcerts/privateKey.key;
        server_name cloud.domain.com;

        root /var/www/owncloud;

        client_max_body_size 10G; # set max upload size

        fastcgi_buffers 64 4K;
        rewrite ^/caldav(.*)$ /remote.php/caldav$1 redirect;
        rewrite ^/carddav(.*)$ /remote.php/carddav$1 redirect;
        rewrite ^/webdav(.*)$ /remote.php/webdav$1 redirect;

        index index.php index.html;

        error_page 403 = /core/templates/403.php;
        error_page 404 = /core/templates/404.php;

        location = /robots.txt {
            allow all;
            log_not_found off;
            access_log off;
        }
        location ~ ^/(data|config|\.ht|db_structure\.xml|README) {
                deny all;
        }
        location / {
                # The following 2 rules are only needed with webfinger
                rewrite ^/.well-known/host-meta /public.php?service=host-meta last;
                rewrite ^/.well-known/host-meta.json /public.php?service=host-meta-json last;
                rewrite ^/.well-known/carddav /remote.php/carddav/ redirect;
                rewrite ^/.well-known/caldav /remote.php/caldav/ redirect;
                rewrite ^(/core/doc/[^\/]+/)$ $1/index.html;
                try_files $uri $uri/ index.php;
        }

        location ~ ^(.+?\.php)(/.*)?$ {
                try_files $1 = 404;

                include fastcgi_params;
                fastcgi_param SCRIPT_FILENAME $document_root$1;
                fastcgi_param PATH_INFO $2;
                fastcgi_param HTTPS on;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
        }

        # Optional: set long EXPIRES header on static assets
        location ~* ^.+\.(jpg|jpeg|gif|bmp|ico|png|css|js|swf)$ {
                expires 30d;
                # Optional: Don't log access to assets
                access_log off;
        }
}

But cloud.domain.com doesn't work! I tried to ping it and it does not resolve to my ip.

Also the weird thing is that i have another vps with the exact configurations using a different domain, lets say domain2.com. In my other vps everything works fine. Both domain2.com and cloud.domain2.com resolve to my vps ip.

I also have identical directory structure.

• website : /var/www/wordpress
• owncloud : /var/www/owncloud

I am using the nameservers from my domain name provider (in both cases).

i have no idea what i am doing wrong.