app_dev.php works, app.php doesn't

[Alhazred]

Hi, I'm a Symfony newbie.
I'm following the book available on Symfony home page.

At the beginning, "Creating Pages in Symfony2" section, it says to create a routes.yml file and after a controller.
Then it says to try the application using the url
http://localhost/app_dev.php/hello/Ryan

I've tried and it works.
The tutorial also says to try
http://localhost/app.php/hello/Ryan

but in this case it doesn't work, at first I had a 404 error, I've cleared the cache and now I obtain a blank page.
What shoult I check to make the app.php work?

[ner0tic]

I'm also encountering the same issue. app_dev.php renders the site no problem, but app.php loads a blank page.

edit:
enabling debugging on the prod renders the site. This seems wrong to me.

[all4pages]

set the permissions again to the app/log and app/cache after clearing the cache

[pécé]

First check is to read app/logs/prod.log. If it doesn't exist, check permissions on app/cache and app/logs as told above...

[DannyVBT]

I ran into this issue too recently, testing out the new RC. I believe the issue was that the AcmeDemoBundle was only being added in app/AppKernel.php if the environment was development. Also make sure you have a proper default route defined in your routing config.