'Reverse Proxy & URL Rewrite

I'm managing a website with Windows IIS installed on a shared server with Plesk Cpanel. All our pages are ASP.net and static HTML's. There's a 3rd party service we're using where our user database is stored and also where we receive our yearly payments. The 3rd party offers a subdomain service meaning, I can configure a URL of mine to redirect to our specific page in the 3rd party without the user noticing it.

Basically, when I type xyz.mydomain.com I'll need the user to go to the serviceprovider.com/myvanityurl

I'm not using Cloudfare so that's not an option. I tried to add some rewrite rules in the webconfig file with no luck. Can you help me what I'm doing wrong?

Do I need to create a subdomain xyz in my server?



Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source