URL problem – Help needed

I have both the wp and blog url set to :

https://www.mysite.com/wp

where my wordpress is installed …

but when I try to access using this url i get an error of no access. For some reason it does not detect the index.php file in my url???

I have updated the website’s root .htaccess to ensure index.php is in it.

Only way to access it is to enter full path:

https://www.mysite.com/wp/index.php

Then i het URL’s formed as follows .. for content of the blog:

https://www.mysite.com/wp/index.php/?cat=3

Extra ‘/’ in my urls which gives errors ………..

Any help please????????????