Keep getting 404 error if I try to make my post title as part of the URL

Hi,
I am trying to use my post titles as part of the domain name.
I am using an IIS 6.0 windows server.

I am trying to change the direct links from default
https://www.roshberosh.com/blog/?p=123
to custom
/%category%/%postname%/

I keep getting 404 when I do that.

My blog is here