Can anyone help with this or point me to a solution
The page with URL rentagent/" can also be accessed by using URL rentagent/Default.aspx".
Search engines identify unique pages by using URLs. When a single page can be accessed by using any one of multiple URLs, a search engine assumes that there are multiple unique pages. Use a single URL to reference a page to prevent dilution of page relevance. You can prevent dilution by following a standard URL format.