Reproduced in 6.1.x and Trunk rev. 133677
Steps to reproduce:
1. On a clean stock liferay instance of 6.1 GA2 , create a new page, then take out all view permissions for all users. Note down the friendly URL
2. Create a new user with only guest role
3. Sign out and sign back in as the new user created
4. Acess the page by typing the friendly URL in browser.
Error message Not found:
The requested resource was not found.
Please update message informing the user that he does not have the permissions to view this page.