There are two WMS endpoints for ApolloCatalogWMS: ApolloCatalogWMS & ApolloCatalogWMSPublic:
>access non-public catalog, web browser should prompt for username and password
>access public catatlog
For public/anonymous catalog access, user can do the following:
 log into Apollo data manager as admin user.
 Right-click on aggregate that user want public access, choose "Security..."
 Add * to Principals, and add "Read" and "Apply to Children" permissions. Then click OK.