subdirectory multisite

I have a subdirectory multisite.

Subdirectory multisite to access the url is not normal

I can't access subdirectories multisite url path in addition to the frontpage

I can access the frontpage of subdirectory multisite, For example, http://sub.example.com/subsite

But i can't access other url path of subdirectory multisite, For example, http://sub.example.com/subsite/user/login | /subsite/admin/content

When I click login on subdirectory multisite frontpage (http://sub.example.com/subsite) , it shows the page cannot be accessed, it is considered to be the primary site page.