Merge pull request #268320 from KennedyDenMSFT/US219108

Metadata & Acrolinx updates

Author: prmerger-automator[bot]

articles/azure-monitor/ip-addresses.md

@@ -53,7 +53,7 @@ Application Insights Agent configuration is needed only when you're making chang
 
 ## Availability tests
 
-This is the list of addresses from which [availability web tests](./app/availability-overview.md) are run. If you want to run web tests on your app but your web server is restricted to serving specific clients, you'll have to permit incoming traffic from our availability test servers.
+This is the list of addresses from which [availability web tests](./app/availability-overview.md) are run. If you want to run web tests on your app but your web server is restricted to serving specific clients, you must permit incoming traffic from our availability test servers.
 
 > [!NOTE]
 > For resources located inside private virtual networks that can't allow direct inbound communication with the availability test agents in public Azure, the only option is to [create and host your own custom availability tests](app/availability-azure-functions.md#review-trackavailability-test-results).
@@ -70,6 +70,9 @@ If you're using Azure network security groups, add an *inbound port rule* to all
 
 Open port 80 (HTTP) and port 443 (HTTPS) for incoming traffic from these addresses. IP addresses are grouped by location.
 
+> [!NOTE]
+> Validate your Azure App Service access restrictions, as you might need to also enable access for availability test IP addresses. For more information, see [Azure App Service access restrictions](../app-service/overview-access-restrictions.md).
+
 ### IP addresses
 
 If you're looking for the actual IP addresses so that you can add them to the list of allowed IPs in your firewall, download the JSON file that describes Azure IP ranges. These files contain the most up-to-date information. After you download the appropriate file, open it by using your favorite text editor. Search for **ApplicationInsightsAvailability** to go straight to the section of the file that describes the service tag for availability tests.