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Function App: Persistent 503 Errors During Host Startup in Azure Functions Flex Consumption

Problem description I am experiencing HTTP 503 errors during the startup of my Azure Functions Flex Consumption host. These errors occur shortly after the host begins initializing, and I am unsure of the cause or how to resolve them. Environment Function…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-11-03T14:06:03.1333333+00:00
Nik-1740 0 Reputation points
commented 2026-11-03T18:21:37.46+00:00
Nikunj Adhaduk 0 Reputation points
1 answer

conda 26.9.4 pixi 0.82.1 virtualenv 21.14.12 pipx 1.18.7 pipenv 2026.10.2 PDM 2.29.4 Pex 2.105.1 cibuildwheel 4.3.5 manylinux and musllinux images 2026.10.26-1 pypa/gh-action-pypi-publish 1.14.3 python-build-standalone 20261026 Hatch 1.18.2 (2) pyenv 2.8.

Note- AI Drafted question because there was a lot to cover. Hi, I have a Python application running as a Linux Azure Function App and I’m trying to understand the behaviour I’m seeing with Python packages after multiple deployments. Current setup: The…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-11-03T12:47:53.27+00:00
Apurva Pathak 960 Reputation points
commented 2026-11-03T17:12:26.0833333+00:00
Apurva Pathak 960 Reputation points
1 answer

Flex Consumption in East US 2 still runs Node.js v22.23.2 after the 22.23.4 release

Product: Azure Functions Hosting plan: Flex Consumption (Linux, SKU FC1) Region: East US 2 Runtime: functionAppConfig.runtime name=node, version=22 linuxFxVersion: empty A worker on this app logged the following on 10/23/2026, 6:40:49.101 AM: Node.js…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-23T10:03:50.3566667+00:00
Grey Cai 0 Reputation points
commented 2026-11-03T14:16:25.3433333+00:00
REDDIMALLA VENKATESH 0 Reputation points Microsoft External Staff Moderator
1 answer One of the answers was accepted by the question author.

Azure Functions Windows Consumption still running vulnerable Node 24.19.0 — when will Node 24.22.1 be available?

Our Production Azure Functions application in East US uses Windows Consumption with FUNCTIONS_WORKER_RUNTIME=node and WEBSITE_NODE_DEFAULT_VERSION=~24. As of October 23, 2026, we verified the running Node worker executable is version 24.19.0, which…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-23T11:06:26.7966667+00:00
Donnie Byrd 20 Reputation points
accepted 2026-11-02T15:41:13.16+00:00
Donnie Byrd 20 Reputation points
2 answers

Azure Functions Easy Auth: Interactive login works with an invalid clientSecretSettingName app setting but fails when the Entra App Registration secret is deleted

PS: The question is drafted with the help of AI because this seems a complex issue, and I was finding it hard to explain everything smoothly. Question I am troubleshooting an unexpected behaviour with Microsoft Entra ID authentication in an Azure…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-29T12:18:16.31+00:00
Apurva Pathak 960 Reputation points
commented 2026-10-29T16:44:10.12+00:00
Tejaswini Billakurthi 765 Reputation points Microsoft External Staff Moderator
0 answers

Multiplle triggers to DB with different parameters using LogicApp

Requirement- We need to call Stored Proc with diff arguments on same interval for 4 opertions.what design will you recommend whether Azure Function or Azure Logic Apps and how to execute multiple triggers using LA/Fun

Azure Functions
Azure Functions

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

6,570 questions
Azure Logic Apps
Azure Logic Apps

An Azure service that automates the access and use of data across clouds without writing code.

3,850 questions
asked 2021-06-11T06:43:38.587+00:00
manu 41 Reputation points
commented 2026-10-29T05:59:15.3533333+00:00
Dewda, Chanchal 0 Reputation points
2 answers

Azure Function app in process , it will still run till Q1 Jan 27

As the title, will the current runtime of .net 8 inprocess Still run till Q1 Jan 2027 ? We have a lot analysis left

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-21T06:33:22.1433333+00:00
vasu soni 0 Reputation points
commented 2026-10-28T15:36:24.8+00:00
R8 Qna 0 Reputation points
2 answers

Azure Functions Flex Consumption — alternating HTTP 503 after 60 seconds and host.json permission errors

We have a Python Azure Functions app on Linux Flex Consumption in UAE North that intermittently returns HTTP 503 after exactly 60.2 seconds. The same read-only endpoint alternates between HTTP 503 after 60 seconds and HTTP 200 in approximately 0.5–1.4…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-27T19:32:45.4366667+00:00
Henry Jakins 0 Reputation points
commented 2026-10-28T12:53:06.6766667+00:00
Henry Jakins 0 Reputation points
4 answers

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.

6,570 questions
asked 2026-10-07T23:02:14.1433333+00:00
Jeff Hoffman 0 Reputation points
answered 2026-10-28T09:13:13.41+00:00
Alex Burlachenko 26,680 Reputation points MVP Volunteer Moderator
1 answer

Azure Functions Flex Consumption Linux Easy Auth — How can rejected 401 requests be correlated before application execution?

We need Microsoft employee or App Service Authentication / Azure Functions platform-team confirmation of the supported evidence method for a pre-production security acceptance check. Environment: Azure Functions Flex Consumption (FC1), Linux, Node.js;…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-14T22:15:13.85+00:00
Kevin Sanchez 0 Reputation points
answered 2026-10-26T10:15:48.35+00:00
kagiyama yutaka 5,655 Reputation points
1 answer

Flex Consumption (West Europe): one worker repeatedly loses DNS for ~60 s (EAI_AGAIN), host lease renewal fails

We see intermittent, per-instance DNS failures on a Flex Consumption app, similar to this earlier thread (Feb 2026), which was closed as a one-day platform incident. For us it is happening now, October 2026. Environment Flex Consumption (FC1), Linux,…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-19T20:57:24.7566667+00:00
Daniel V 0 Reputation points
commented 2026-10-26T09:29:36.28+00:00
Daniel V 0 Reputation points
1 answer

Azure Functions Linux Consumption: how to get Node.js 22.23.4 for CVE-2026-111497?

We run two Azure Function Apps in West Europe on the classic Linux Consumption plan (Y1/Dynamic, not Flex Consumption): subscription: e6e530d0-bab6-4139-90a5-8fd122170ee8 Both use the platform-managed runtime with linuxFxVersion set to NODE|22.…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-23T13:02:16.2+00:00
lk-di 5 Reputation points
commented 2026-10-26T08:44:37.84+00:00
lk-di 5 Reputation points
1 answer One of the answers was accepted by the question author.

I'm facing an issue while configuring VNet Integration for an Azure Function App (Premium Plan).

When a NAT Gateway is attached to the integration subnet, VNet integration for the Function App fails with the error: “Delegated subnet cannot be attached to StandardV2 NAT Gateway.” When I remove the NAT Gateway from the subnet, the Function App is…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-01-21T21:39:39.1166667+00:00
Nagendra Matharasi 20 Reputation points
commented 2026-10-26T07:12:22.4466667+00:00
JuliaMarvin 23,690 Reputation points Volunteer Moderator
1 answer One of the answers was accepted by the question author.

Confirm Node.js 22.23.4 rollout for CVE-2026-105482 on Azure Functions Flex Consumption

Node.js published security release v22.23.4 on October 21, 2026. Reference: Node.js Security Releases This release remediates CVE-2026-105482 and other high-severity vulnerabilities affecting Node.js 22.x. Question: Has v22.23.4 or a later patched…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-22T08:56:29.0633333+00:00
Thanh Cong Nguyen 30 Reputation points
accepted 2026-10-26T03:47:07.6966667+00:00
Thanh Cong Nguyen 30 Reputation points
3 answers

Azure Functions .NET In-Process Retirement (10 Nov 2026): Clarification Needed on Post-Retirement Runtime Availability, Deployments, DR, and SLA Commitments

Product Azure Functions Environment We currently operate multiple production Azure Function Apps using: Azure Functions v4 .NET 6 In-process hosting model Dedicated App Service Plans App Service Environment (ASE)-hosted workloads Azure DevOps CI/CD…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-23T15:53:45.64+00:00
Rahul Kapoor 0 Reputation points
edited the question 2026-10-25T23:52:27.7633333+00:00
Jay Pham (WICLOUD CORPORATION) 4,680 Reputation points Microsoft External Staff Moderator
1 answer One of the answers was accepted by the question author.

Migrate your Azure Functions applications

I have received notification Migrate your Azure Functions applications from the Linux Consumption plan to the Flex Consumption plan before 30 September 2028 I have a few apps on Pricing Tier: Dynamic (Y1:0) and Operating System: Linux What I do not…

Azure Functions
Azure Functions

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

6,570 questions
asked 2025-10-02T09:26:04.44+00:00
commented 2026-10-24T21:03:33.85+00:00
Mohsin Khan 85 Reputation points
1 answer

ServerFarmCreationNotAllowed in multiple regions – Pay-As-You-Go subscription

Hello Microsoft Azure team, I'm unable to create an Azure Functions Flex Consumption app in my personal Pay-As-You-Go subscription. The error is: "The subscription is not allowed to create or update the serverfarm." Verified: Subscription is…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-23T22:19:28.7666667+00:00
Nils Drews 0 Reputation points
answered 2026-10-24T12:57:37.7333333+00:00
Vinodh247-1375 44,801 Reputation points Volunteer Moderator
1 answer One of the answers was accepted by the question author.

.NET 6 and In-process model retirement

We are currently operating Azure Functions based on .NET 6 using the in-process hosting model. While we understand that existing workloads are expected to continue running beyond the announced retirement date, we need clarity regarding the operational…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-03-04T06:16:46.8066667+00:00
Miarczynski, Artur 25 Reputation points
commented 2026-10-23T15:38:55.87+00:00
JuliaMarvin 23,690 Reputation points Volunteer Moderator
1 answer

Flex Consumption: serverfarms/write registra GatewayTimeout y Failed, pero el plan aparece posteriormente Ready tras eliminaciones Succeeded

Estoy investigando un incidente no productivo de Azure Functions Flex Consumption en East US. Busco orientación sobre el seguimiento de operaciones ARM y las comprobaciones necesarias antes de repetir el aprovisionamiento. Cronología del 20/10/2026, en…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-20T15:41:27.2433333+00:00
Fernando González 0 Reputation points
answered 2026-10-22T04:27:41.9866667+00:00
HassanNazeer 0 Reputation points
2 answers

Azure App Service stuck in QuotaExceeded — HTTP 503 and Site Disabled

My Azure Web App valwithproof- in resource group ValWithProof-RG is unavailable. The app state remains QuotaExceeded, and the website returns HTTP 503. Diagnostics show HTTP 403 with substatus 67: “Site Disabled (quota enforcement or…

Azure Functions
Azure Functions

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

6,570 questions
asked 2026-10-20T03:53:35.08+00:00
Abhishek Jyothi 0 Reputation points
answered 2026-10-21T14:21:10.0166667+00:00
REDDIMALLA VENKATESH 0 Reputation points Microsoft External Staff Moderator