6,553 questions with Azure Functions tags

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1 answer One of the answers was accepted by the question author.

How do I configure auto-scaling AND troubleshoot cold starts on Azure Functions?

I run a .NET 8 isolated Azure Function on the Consumption plan. I need to (1) understand how to set up auto-scale behavior and (2) reduce noticeable cold-start latency for HTTP-triggered functions. Please cover both topics in one answer.

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-13T23:16:09.4233333+00:00
Gini Hu 0 Reputation points
accepted 2026-10-13T23:17:31.0633333+00:00
Gini Hu 0 Reputation points
1 answer

Azure Functions Flex Consumption blocked by ServerFarmCreationNotAllowed (Forbidden 70001)

Hello Microsoft Azure Support and Community, I am developing a non-production Azure Functions gateway for MyWorker Thailand. I am unable to create an Azure Functions Flex Consumption app in the Southeast Asia region. Environment Subscription: Azure…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-13T21:17:46.1033333+00:00
MyWorkerThailandDev 0 Reputation points
commented 2026-10-13T21:30:59.8333333+00:00
MyWorkerThailandDev 0 Reputation points
2 answers

Function App: ZIP publish returns HTTP 400 without deployment ID — Deployment validation issue

Problem description I am experiencing an issue when publishing a ZIP package to my Function App. The deployment returns an HTTP 400 error, and no deployment ID is generated. I need guidance on how to troubleshoot this problem and the supported methods…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-12T17:00:45.68+00:00
Javonte Maynor 0 Reputation points
commented 2026-10-13T18:23:10.6133333+00:00
Likhitha Sulake 105 Reputation points Microsoft External Staff Moderator
0 answers

Function App: Troubleshooting 403 Forbidden on Test/Run and Admin Path Access

Problem description I am experiencing a 403 Forbidden error when attempting to test my Function App via the Azure portal Test/Run feature. The logs are empty, and the request does not reach my function code. I suspect there might be an authorization or…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-13T15:49:41.0666667+00:00
EricMeierotto-5130 0 Reputation points
1 answer

Azure Function App creation fails with ServerFarmCreationNotAllowed

Hello, I am trying to create an Azure Function App, but the deployment consistently fails with the following error: InvalidTemplateDeployment ValidationForResourceFailed ServerFarmCreationNotAllowed The error message is: "The subscription is not…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-13T13:36:45.14+00:00
eddy arevian 0 Reputation points
commented 2026-10-13T13:55:26.4033333+00:00
eddy arevian 0 Reputation points
3 answers

Azure Function Deployment Issue: [Kudu-RemoveWorkersStep] Fails with HttpClient.Timeout

I’m trying to publish a TypeScript Azure Function to a Function App running on Flex Consumption plan. Inbound traffic to the Function App is disabled. Outbound traffic goes into a VNET. The storage account has public access disabled and Private…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2025-08-28T12:03:22.3133333+00:00
Davydenko Vadym 5 Reputation points
answered 2026-10-13T10:02:25.5+00:00
Davydenko Vadym 5 Reputation points
3 answers

When will .NET 6 in-process be shut down?

The in-process model will be retired starting November 10, 2026. The question is, when will it actually shut down? It's highly relevant for us as we use it in some legacy systems that run in places we really rather not touch any time soon. Or if we have…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-12T14:19:27.0366667+00:00
Simon Baumgärtner 0 Reputation points
commented 2026-10-13T08:17:39.61+00:00
Fabian Zankl 345 Reputation points
2 answers

Azure Functions Linux Consumption: OAuth-uploaded package blob causes 503, identical Shared Key overwrite starts

I am troubleshooting a .NET 9 isolated Azure Functions v4 app on Linux Consumption (North Europe). The app runs a few Service Bus/timer functions and uses an external, immutable ZIP package in a private Azure Blob container. Its system-assigned managed…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-12T10:10:57.06+00:00
Cloud Infrastructure Lab 0 Reputation points
answered 2026-10-13T04:52:51.01+00:00
Cloud Infrastructure Lab 0 Reputation points
2 answers

Node.js v4 Azure Function POST returns empty 404 while GET works on the same Flex Consumption app

Environment: JavaScript, Node.js 24 Azure Functions programming model v4 @azure/functions 4.16.5 Linux Flex Consumption, UK South Easy Auth requiring authenticated application tokens CREATE registration: app.http("guardCreateObject", { …

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-12T00:11:24.7633333+00:00
Ade Jabar 0 Reputation points
edited an answer 2026-10-12T14:55:57.8933333+00:00
Fabian Zankl 345 Reputation points
1 answer One of the answers was accepted by the question author.

Guide to securing HTTP triggered Azure Function using Access Token acquired from MSAL in mobile app

Hello community. I've reach the point of feeling pretty despondent at the documentation for working with Microsoft Entra ID. I am using Entra ID to support external customers and have integrated Native Auth using MSAL in a mobile app which is written in…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-05-07T18:48:41.6333333+00:00
Richard Mackriell 65 Reputation points
commented 2026-10-09T11:09:58.64+00:00
Chandimal Wickramaratne 0 Reputation points
1 answer

Couple of functions not executing after upgrade

after upgrading from inprocess to Isolated couple of functions not executing throwing error Failed indexing and will be disabled

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2025-11-26T07:27:02.4+00:00
Jinugu, Manasa 0 Reputation points
commented 2026-10-08T16:17:11.5966667+00:00
JuliaMarvin 23,095 Reputation points Volunteer Moderator
1 answer

Application Insights: Missing telemetry from FunctionApp-Investigation and Next Steps

Problem description I have a production Azure Function App running Python 3.12 on Flex Consumption in Central US. The Function App executes successfully, but standard Application Insights telemetry from the Function runtime is not appearing in the…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-07T23:02:14.1433333+00:00
Jeff Hoffman 0 Reputation points
edited the question 2026-10-08T09:17:13.4+00:00
Rakesh Mishra 11,510 Reputation points Microsoft External Staff Moderator
1 answer

Is there a public roadmap or GA target timeframe for durabletask-js?

We're evaluating @microsoft/durabletask-js for production use. The documentation currently lists JavaScript as Preview while .NET, Java, and Python are GA. Is there any public guidance on the roadmap or expected GA timeframe?

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-07T18:16:08.84+00:00
Arbelaez, Nelson 0 Reputation points
edited the question 2026-10-08T00:22:22.94+00:00
Jay Pham (WICLOUD CORPORATION) 4,680 Reputation points Microsoft External Staff Moderator
1 answer

.NET 10 isolated host fails on Linux EP1; .NET 8 succeeds

I am trying to upgrade an Azure Functions v4 app from .NET isolated 8.0 to .NET isolated 10.0. Environment: Azure Functions v4, .NET isolated Linux Elastic Premium EP1 UK South ASP.NET Core HTTP functions Deployed as a ZIP package Worker packages…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-05T16:26:10.18+00:00
Misha Anker 41 Reputation points
commented 2026-10-05T17:31:56.14+00:00
Fabian Zankl 345 Reputation points
3 answers

Azure Function does not recognise or trigger from a once-daily TimerTrigger, but a trigger every 2 or 3 minutes works

I'm attempting to set my .NET 10 function app to run every day at midnight using the following TimerTrigger NCRONTAB expression: [Function("Reconciliation")] public async Task Run( // Trigger the function every 24 hours at midnight …

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-08-26T16:31:09.2566667+00:00
Adam 0 Reputation points
edited an answer 2026-10-05T15:39:47.31+00:00
Fabian Zankl 345 Reputation points
0 answers

Azure Functions Flex Consumption: supported VNet attachment with controlled provider registration and retries

We are preparing to attach an existing non-production Azure Functions Flex Consumption app to an existing subnet delegated to Microsoft.App/environments, then admit only that subnet through an Azure SQL virtual-network rule. We want the standard…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-04T19:52:18.8566667+00:00
Hiscock, Steve 0 Reputation points
1 answer

Azure Functions Flex Consumption: subnet service-association link ownership and supported VNet disconnection

I am seeking clarification of the supported Azure API contract before disconnecting VNet integration for a non-production Azure Functions Flex Consumption app. No backend cleanup or deletion of platform-managed resources is requested. Observed shape…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-09-28T12:23:39.6433333+00:00
Hiscock, Steve 0 Reputation points
commented 2026-10-04T19:44:16.46+00:00
Hiscock, Steve 0 Reputation points
0 answers

Azure Functions Flex Consumption: intermittent HTTP 503 after ~60 seconds on Entra sign-in callback

Hello,I’m seeking help diagnosing recurring “The service is unavailable” responses from an Azure Function App. Reloading sometimes restores access, but the interruptions recur during normal use.The clearest captured failure is an HTTP 503 on the…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-10-02T17:47:38.6033333+00:00
David H. Campbell 20 Reputation points
commented 2026-10-02T19:05:27.8766667+00:00
David H. Campbell 20 Reputation points
2 answers

Unable to see the attributes under customdimenstions of Application insights when set the attributes using ILogger.BeginScope

was trying to set attribute and its value using ILogger.BeginScope in Azure function. theory says when we set the attributes using ILogger.BeginScope, we can see those attributes under customdimensions section of Application insights. have tried and…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-09-09T13:57:59.5933333+00:00
Rayappa Bankapur (CSEC) 0 Reputation points
answered 2026-10-02T11:58:22.5333333+00:00
Paul Thomas 80 Reputation points
1 answer

Function App: Fails Validation During Same-Subscription Resource Group Move — ResourceMoveProviderValidationFailed

Problem description I am trying to move a Linux Function App within the same subscription from one resource group to another, but the move fails validation with the error ResourceMoveProviderValidationFailed. The validation indicates that certain…

Azure Functions
Azure Functions

An Azure service that provides an event-driven serverless compute platform.

6,553 questions
asked 2026-09-30T22:57:21.8133333+00:00
Agustin Cano 40 Reputation points
commented 2026-10-01T00:58:14.5466667+00:00
Rakesh Mishra 11,510 Reputation points Microsoft External Staff Moderator