I have a root site collection at https://a.site.com
Underneath this root site collection I have another site collection (host named) at https://a.site.com/sub
The URL I want to tell them to use is https://a.site.com
I have tried to use HTTP Redirect in IIS but have not been able to make it work correctly. The browser will throw "too many redirect" errors or the web server will show an error about the directory not existing.