DSN, Apache Virtual Hosting, Host alias

I am hosting several domains on one httpd Apache server using the virtual host feature. I also run a DNS server. I have DNS zone configured for each virtual host domain to recognize the typical alias www. The servername attribute for the apache virtual host is configured with the www alias in it. So for domain soluprobe.net I have the virtual host servername set to www.soluprobe.net. My problem is right now the apache server will not recognize a URL referencing just the domain. So, www.soluprobe.net works but soluprobe.net doesn’t (page not found) even though DNS appear to be configured. So, I am guessing I am missing an attribute in the Apache server config for each virtual host. Can someone point me in the right direction.