Set-AzureRmApplicationGateway throws "Object reference not set to an instance of an object" the first time it runs after "Add-AzureRmApplicationGatewayHttpListener"

[adityapenmetsa]

Cmdlet(s)

$appgateway = Add-AzureRmApplicationGatewayHttpListener -ApplicationGateway $appgw -Name $backendAddressPoolName -FrontendIPConfiguration $fipconfig01 -FrontendPort $fp01 `
-Protocol Https -HostName $hostName -RequireServerNameIndication true -SslCertificate $cert

$UpdatedAppGw = Set-AzureRmApplicationGateway -ApplicationGateway $appgateway

PowerShell Version

5.1.14393.953

Module Version

OS Version

10.0.14393.953

Description

I am trying to add new HTTP listener to already existing Azure Application Gateway. After successfully running the cmdlet "Add-AzureRmApplicationGatewayHttpListener", the application gateway needs to be updated by running the cmdlet "Set-AzureRmApplicationGateway". It is here where the cmdlet throws "Object reference not set to an instance of an object" error the first time it is run. On retry, it successfully gets updated. I have tried the process repeatedly by deleting and adding the listeners, and this scenario is seen on every try.

Debug Output

Set-AzureRmApplicationGateway : Object reference not set to an instance of an object.
At line:94 char:29

• ... atedAppGw = Set-AzureRmApplicationGateway -ApplicationGateway $appgat ...

•             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  

  • CategoryInfo : CloseError: (:) [Set-AzureRmApplicationGateway], NullReferenceException
  • FullyQualifiedErrorId : Microsoft.Azure.Commands.Network.SetAzureApplicationGatewayCommand

Script/Steps for Reproduction

[markcowl]

@DeepakRajendranMsft Can you take a look?

[blarsonrp]

I am also getting this error with trying to finalize my add-azurermapplicationgatewayrequestroutingrule changes with Set-AzureRmApplicationGateway -ApplicationGateway $AppGw1 on azurerm.netwrok version 4.2.1

[alexhisen]

Also happens after Set-AzureRmApplicationGatewayHttpListener -ApplicationGateway $agw -Name API -SslCertificate $cert -Protocol Https

[fogers777]

any update?

[DailyReminder]

I'm also experiencing this. Does anyone know of a solution or work around?

[parsoFish]

Also experiencing this after a AzureRmApplicationGatewayRequestRoutingRule is there any progress on this issue?

[maddieclayton]

@akshaysngupta Can you take a look at this issue?

[akshaysngupta]

This is the sequence of cmdlets that reproduces this error

$fePort = New-AzureRmApplicationGatewayFrontendPort -Name "$name-FePort" -Port 443
$appgw = New-AzureRmApplicationGateway -FrontendPort $fePort ...
$appgw = Add-AzureRmApplicationGatewayHttpListener -ApplicationGateway $appgw -FrontendPort $fp01
Set-AzureRmApplicationGateway -ApplicationGateway $appgw

New-AzureRmApplicationGateway resets the $fePort.Id to an empty string which causes Null reference exception.

azure-powershell/src/ResourceManager/Network/Commands.Network/ApplicationGateway/NewAzureApplicationGatewayCommand.cs

Line 290 in cb13d2d

ApplicationGatewayChildResourceHelper.NormalizeChildResourcesId(applicationGateway);

azure-powershell/src/ResourceManager/Network/Commands.Network/ApplicationGateway/ApplicationGatewayChildResourceHelper.cs

Line 168 in cb13d2d

httpListener.FrontendPort.Id = NormalizeApplicationGatewayNameChildResourceIds(

Workaround:
Before performing a set, use Get cmdlets to fetch the referenced resources like ex- port and ipconfig for httplistener

Will update the issue with fix timeline.

[nun3r]

Any update on a fix for this?

[EvgenyAgafonchikov]

Fixed by #8576