I dont know why my custom post types render the Page not found. This is the code I am using to register custom posts.
www.example.com/products/product1/
renders 404 where as www.example.com/?products=product1
is perfectly fine.
add_action( 'init', 'create_post_type' );
function create_post_type() {
register_post_type('products', array(
'label' => __('Products'),
'singular_label' => __('Product'),
'public' => true,
'show_ui' => true, // UI in admin panel
'_builtin' => false, // It's a custom post type, not built in!
'_edit_link' => 'post.php?post=%d',
'capability_type' => 'post',
'hierarchical' => false,
'rewrite' => array("slug" => "products"), // Permalinks format
'supports' => array('title','author')
));
}