I am not on shift 24/7 and i need to automate the iisreset. Needed a powershell script to test the https://@#$%^&. and if its down do an IISRESET.

A scheduled script to test availability every 20 minutes

Why not just fix the problem?

You do not need a PowerShell script.  IISReset is a system utility.  It does not use PowerShell.  Just schedule it directly.

What is down?  How are you defining down?  Not Internet?  No database?  What?  Down is not a technical term.

Down = Offline

The product (web application was built by a Vendor) Vendor is here no more.

Down = Offline

The product (web application was built by a Vendor) Vendor is here no more.

How do you determine if it is offline.   A web application is running or not.  That is complex issue depending on the application and how it is deployed.  If you do not know how to test that then you need the vendor.  If the vendor is gone you will need to hire a consultant to work with you too fix it.

This is a scripting forum.  It is not a fix my web server forum.  IISReset can be run as a task and reset the web server or any application.  It is up to you to say how you determine if an application is offline.