Configure IBM HTTP Server 7 with WAS 7

Question

Dear All, I've configured IBM HTTP Server 7.0 with WebSphere Portal Server 6.1.5. I'm able to access Portal without typing the port number. I need to create a Virtual Host. But this is not working.

NameVirtualHost gp.testhost.com
<VirtualHost gp.testhost.com:80>                                                    
    DocumentRoot C:/Portal/Portal_DocRoot                 
    ServerName test.testhost.com                              
</VirtualHost>

ServerName is my host name as mentioned in the host file. I have an index.html file located in C:/Portal/Portal_DocRoot . But whenever I access the http://gp.testhost.com, I get Page Cannot be found message. I stopped the Application Server and still I'm not able to access the file. Please help me to solve this issue. Any help will be greatly appreciated.