Asp.Net Core hosted IIS with custom Url

Hello Everyone,

I have hosted my Asp.Net Core Website on a Windows Server 2012 on IIS. It runs locally on the server.

In the Log it says: "http://localhost:31244"

How and where do I change that, so that I can access it again over www.mydomain.com/sub

It used to work under the old asp.net version, I was able to access my website overwww.mydomain.com/sub

I would appreciate any help greatly! Kindest Blessings