Issues while debugging a published Azure function

Ritesh Jain 16

I am trying to debug a published Azure function app. I've followed all the steps as per the below link but was unable to succeed. It looks remote debugger is not being started. Any suggestions will be helpful. Thanks!

Azure function debugging

The error message is -

ErrorMsg

2 answers

navba-MSFT 24,795 Reputation points Microsoft Employee

2023-09-27T07:41:19.37+00:00

@Ritesh Jain Welcome to Microsoft Q&A Forum, Thank you for posting your query here!

I understand that you are encountering the error System.Runtime.InteropServices.COMException (0x89710023) while performing remote debugging of your Azure function App.

Please follow the below action plans for now:

1.Ensure that you have enabled the remote debugging option for your function app and selected the right VS version as shown below:

2.Please make sure your firewall allows port 4024 and its not blocked in your network. You can do a telnet to this port and check from your box.

For more details, refer to Configure the Windows Firewall for Remote Debugging and Remote Debugging Errors and Troubleshooting.

3.Check out Azure Remote Debugging: Failed to enable remote debuggingException from HRESULT: 0x89710023

4.Ensure that you have Downloaded and Installed the remote tools required for remote debugging. see here.

5.While publishing your Function App ensure that you have set the config to Debug mode.

6.To isolate this issue, try remote debugging from a different machine or a different network and check if that works fine.

If you still see the same issue even after following the above action plan, please do let me know. I would be happy to assist you further.

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Ritesh Jain 16 Reputation points

2023-09-28T06:07:52.4866667+00:00

Thank you so much, will try the suggestions and revert.
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Ritesh Jain 16 Reputation points

2023-10-06T09:15:45.0566667+00:00

I tried setting up all the provided steps but still no luck. I tried running the telnet command and got a failure error. Not sure if that is the culprit.
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navba-MSFT 24,795 Reputation points Microsoft Employee

2023-10-06T09:40:37.81+00:00

@Ritesh Jain Thanks for getting back and sharing the telnet screenshot. The syntax is as shown below:

telnet functionappremoteXXXXXXXXXX.azurewebsites.net 4024

Please edit the above url host depending on your endpoint and try running the command again and check if the port is open.

Ritesh Jain 16 Reputation points

2023-10-09T08:41:53.6+00:00

I ran the suggested command, it looks like it ran successfully. Can you please guide me on how I can check and confirm if the port is open?

navba-MSFT 24,795 Reputation points Microsoft Employee

2023-10-09T08:56:25.8366667+00:00

@Ritesh Jain While running the telnet command from your cmd prompt, you should get a blank (console) window which means that the port is open.

Alternatively, You can download the port query UI tool and extract its contents. Then launch the portqueryui.exe fill the required details as shown below and click on Query button:

You should see an output saying Listening:

Ritesh Jain 16 Reputation points

2023-10-10T07:01:37.7133333+00:00

The port is open, still unable to debug the azure fn.

navba-MSFT 24,795 Reputation points Microsoft Employee

2023-10-10T07:07:52.6366667+00:00

@Ritesh Jain Thanks for getting back and confirming this. Looks like this issue requires a closer troubleshooting. Could you please open a support ticket with Microsoft, so that our support professionals can get in touch with you and assist you further ?

If you don't have a support plan to open a ticket, please let me know. I can share the next steps with you.

Ritesh Jain 16 Reputation points

2023-10-11T10:55:45.4133333+00:00

To create a support ticket with MS, I need to re-create the Azure function under corporate subscription. Currently, I've created the Azure fn under the VS subscription. If I want to continue with that VS subscription, how can I open an MS ticket?

navba-MSFT 24,795 Reputation points Microsoft Employee

2023-10-11T11:43:13.01+00:00

@Ritesh Jain Thanks for getting back. To submit an incident in the Azure portal by using your Visual Studio subscription technical support benefit for issues relating to Azure for opening a support ticket:

Visit https://portal.azure.com and sign in

From the left-hand navigation, select Help + Support

Under “Support”, select New Support Request

Ritesh Jain 16 Reputation points

2023-10-12T06:39:48.9133333+00:00

Do I need to pay or if I need to opt for other option.

navba-MSFT 24,795 Reputation points Microsoft Employee

2023-10-12T06:42:55.46+00:00

@Ritesh Jain I can enable One time free support ticket for your subscription.

Please send an email to AzCommunity@microsoft.com ( with subject "Attn: Naveen") and provide your subscription id details.

Ritesh Jain 16 Reputation points

2023-10-12T06:43:24.2533333+00:00

Done.

Ritesh Jain 16 Reputation points

2023-10-12T10:57:24.0866667+00:00

We created support request 2310120030003840 for you: 'Unable to debug a publish...'.

navba-MSFT 24,795 Reputation points Microsoft Employee

2023-10-12T11:50:56.9+00:00

@Ritesh Jain Thanks for creating the support ticket. You will be contacted by our Microsoft Support professionals and they will assist you to troubleshoot this issue.
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Issues while debugging a published Azure function

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