Merge pull request #7863 from MikeBazMSFT/patch-18

Correct health probe to match best practices

Author: GitHubber17

articles/active-directory/connect/active-directory-aadconnect-azure-adfs.md

@@ -182,18 +182,21 @@ Select the newly created ILB in the Load Balancers panel. It will open the setti
 
 **6.3. Configuring probe**
 
-In the ILB settings panel, select Probes.
+In the ILB settings panel, select Health probes.
 
 1. Click on add
 2. Provide details for probe
    a. **Name**: Probe name
-   b. **Protocol**: TCP
-   c. **Port**: 443 (HTTPS)
-   d. **Interval**: 5 (default value) – this is the interval at which ILB will probe the machines in the backend pool
-   e. **Unhealthy threshold limit**: 2 (default value) – this is the threshold of consecutive probe failures after which ILB will declare a machine in the backend pool non-responsive and stop sending traffic to it.
+   b. **Protocol**: HTTP
+   c. **Port**: 80 (HTTP)
+   d. **Path**: /adfs/probe 
+   e. **Interval**: 5 (default value) – this is the interval at which ILB will probe the machines in the backend pool
+   f. **Unhealthy threshold limit**: 2 (default value) – this is the threshold of consecutive probe failures after which ILB will declare a machine in the backend pool non-responsive and stop sending traffic to it.
 
 ![Configure ILB probe](./media/active-directory-aadconnect-azure-adfs/ilbdeployment4.png)
 
+We are using the /adfs/probe endpoint that was created explictly for health checks in an AD FS environment where a full HTTPS path check cannot happen.  This is substantially better than a basic port 443 check, which does not accurately reflect the status of a modern AD FS deployment.  More information on this can be found at https://blogs.technet.microsoft.com/applicationproxyblog/2014/10/17/hardware-load-balancer-health-checks-and-web-application-proxy-ad-fs-2012-r2/.
+
 **6.4. Create load balancing rules**
 
 In order to effectively balance the traffic, the ILB should be configured with load balancing rules. In order to create a load balancing rule,