All the products are displayed on the store correctly, but one concrete product is not displaying on frontend. This product is a configurable product, and was visible some time ago.
I checked the following steps:
I reindexed all and cleaned all the caches, the product is still not visible.
Product is enabled
Visibility is set on 'Catalog, Search'
Product is added to all websites
Product is asigned to more than one category, the cateories are visible
Product inventory is set to 'manage stock' and is 'in stock'
Simple associated products (childs) to this configurable product are 'in stock' and have stock quantity greater than 0
Product has images
Category display mode is set to display products, actually is displaying the rest of products.
Copy the url key from backend/catalog/product and paste it in the browser displays a 404
And after checking all this points I have no idea why this product is not displaying on front.