Merge pull request MicrosoftDocs#3241 from ShuheiUda/patch-3

Update application-gateway-web-app-powershell.md

Author: GitHubber17

articles/application-gateway/application-gateway-web-app-powershell.md

@@ -45,7 +45,7 @@ $probe = Get-AzureRmApplicationGatewayProbeConfig -name webappprobe2 -Applicatio
 Set-AzureRmApplicationGatewayBackendHttpSettings -Name appGatewayBackendHttpSettings -ApplicationGateway $gw -PickHostNameFromBackendAddress -Port 80 -Protocol http -CookieBasedAffinity Disabled -RequestTimeout 30 -Probe $probe
 
 # Add the web app to the backend pool
-Set-AzureRmApplicationGatewayBackendAddressPool -Name appGatewayBackendPool -ApplicationGateway $gw -BackendIPAddresses $webappFQDN
+Set-AzureRmApplicationGatewayBackendAddressPool -Name appGatewayBackendPool -ApplicationGateway $gw -BackendFqdns $webappFQDN
 
 # Update the application gateway
 Set-AzureRmApplicationGateway -ApplicationGateway $gw
@@ -95,7 +95,7 @@ $publicip = New-AzureRmPublicIpAddress -ResourceGroupName $rg.ResourceGroupName
 $gipconfig = New-AzureRmApplicationGatewayIPConfiguration -Name gatewayIP01 -Subnet $subnet
 
 # Create a backend pool with the hostname of the web app
-$pool = New-AzureRmApplicationGatewayBackendAddressPool -Name appGatewayBackendPool -BackendIPAddresses $webapp.HostNames
+$pool = New-AzureRmApplicationGatewayBackendAddressPool -Name appGatewayBackendPool -BackendFqdns $webapp.HostNames
 
 # Define the status codes to match for the probe
 $match = New-AzureRmApplicationGatewayProbeHealthResponseMatch -StatusCode 200-399