Azure Function app stopped responding

Mohsin Ali 0

My azure function app is associated to VNet. The whole setup was working absolutely fine till yesterday. Since morning today, the app is not available. I tried to access through browser and it says that the app is not reachable. If I try to deploy code form Azure CLI it also ended with exception that target connection is closed and not responding.

The runtime I am using is .Net

Any help on this to figure out the issue?

Abiola Akinbade 23,060 Reputation points

2025-02-06T08:07:16.1466667+00:00
Hello Mohsin Ali,

Thanks for your question. Test the following:

Check the Kudu console if each instance of your Function App has been assigned a private IP address. Select Development Tools > Advanced Tools > Go in the kudu console
set | grep WEBSITE_PRIVATE_IP
See: https://learn.microsoft.com/en-us/troubleshoot/azure/app-service/troubleshoot-vnet-integration-apps

Also, in the Storage Account check that your Function App’s VNet is listed under the allowed networks.

If Application Insights is enabled, review the logs

You can mark it 'Accept Answer' and 'Upvote' if this helped you

Regards,

Abiola
Shireesha Eeraboina 1,635 Reputation points Microsoft Vendor

2025-02-07T07:36:08.65+00:00

Hi @Mohsin Ali ,

Just checking in to see if the below answer provided by @Abiola Akinbade helped.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.
Mohsin Ali 0 Reputation points

2025-02-07T14:46:07.1766667+00:00

Hi,

I followed the steps mentioned above, but even the Kudu console is not opening.
Shireesha Eeraboina 1,635 Reputation points Microsoft Vendor

2025-02-10T04:05:06.9666667+00:00
Hi @Mohsin Ali ,

Welcome to the Microsoft Q&A Platform! Thank you for asking your question here.

I understand that you're having trouble accessing the Kudu console, which makes troubleshooting a bit more challenging. Here are some additional steps you can take to diagnose the issue with your Azure Function App:

Make sure that the VNet integration for your Function App is correctly configured. If the app was functioning well before, it's possible that changes in network settings or firewall rules have occurred, which could now be preventing access.

Ensure that the storage account linked to your Function App permits traffic from the VNet. If the storage account's firewall is enabled, it needs to be configured to allow access from your Function App.

If you have Application Insights enabled, review the logs for any errors or warnings that could offer additional insights into why the Function App is inaccessible.

If you're unable to access the Kudu console, try going directly to the Azure portal to check the status of your Function App and any associated resources. Look for any alerts or notifications that may indicate potential issues.

For your reference, please review the following documentations for further clarification:

Azure Functions networking options

Troubleshoot error: "Azure Functions Runtime is unreachable"

I hope this answers your query! Let me know if you require any additional help or clarification.
Shireesha Eeraboina 1,635 Reputation points Microsoft Vendor

2025-02-11T05:10:58.08+00:00

Hi @Mohsin Ali ,

Just checking in to see if the information above was helpful. If you have any further updates on this issue, please feel free to post them here.

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