Page not found (error 404)

The page http://pier78.altervista.org/category/diario/?doing_wp_cron=1495251185.4394180774688720703125 was not found on this server.

This can be due to:

Pay attetion to UPPER and LOWER cases
http://site.altervista.org/Page.html is different from http://site.altervista.org/page.html