To prevent that usernames are publically visible, the username in the author's permalink is replaced with the author's ID. In case the page is invoked with the default permalink structure, it is displayed "Page not found".
Additionally it is possible to modify the author base. It is recommended to make use of this plugin to change it, but it also works with other plugins that have the functionality to customize the author base.
תוסף זה זמין להורדה ולשימוש דרך שברשותך.