I have set up some virtal host to distinguish between my subdomains (/etc/httpd/conf.d/*.conf).
This was working on my old server (Debian 7). But now if I browse the root page I get the first defined VirtualHost displayed.
Also if I am browsing an undefined subdomain I get the first VirtualHost config displayed.
<VirtualHost *:80>
ServerAdmin admin@example.com
ServerName sub1.example.com
ServerAlias sub1.example.com
DocumentRoot /home/sub/sub_sub1/www
ServerAdmin Admin
CustomLog /home/sub/sub_sub1/logs/access.log combined
ErrorLog /home/sub/sub_sub1/logs/error.log
LogLevel warn
<Directory /home/sub/sub_sub1/www>
Require all granted
</Directory>
</VirtualHost>