[Zope] Query on adding a siteroot object.

Hi, I am having Zope 2.5. After adding a siteroot object with path 'http://xyz.mydomain.com in a folder, I am not able to open that folder again. It throws up the following page. Forbidden You don't have permission to access /manage_main on this server. Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request. Apache/2.0.35 Server at xyz.mydomain.com Port 80 What might be the reason? Also, some pointers on how to configure apache to access zope contents will be helpful. Thank you. Regards, Paul.