Unable to open Workflow in designer view

[sadanandan28-cloud]

Severity

P1 - Critical (Blocking production)

Describe the Bug with repro steps

Does this occur consistently?
Repro steps:

Action: azureLogicAppsStandard.openDesigner
Error type: ECONNREFUSED
Error message: connect ECONNREFUSED 127.0.0.1:8000
Correlation Id: E6632627-9471-45DC-8027-BA1F250E83F0
Session id: 9bda20e0-eb20-458d-8b81-789fe8b78c4b1775538288939
Extension version: 5.230.15
Extension bundle version: 1.160.21
OS: win32 (Windows_NT 10.0.26100)
OS arch: x64
Product: Visual Studio Code
Product version: 1.106.3
UTC time: Wed, 08 Apr 2026 06:10:16 GMT

Settings

{
  "dataMapperVersion": 2,
  "validateFuncCoreTools": true,
  "autoRuntimeDependenciesPath": "C:\\Users\\sadanandan.varadhara\\.azurelogicapps\\dependencies",
  "autoRuntimeDependenciesValidationAndInstallation": true,
  "parameterizeConnectionsInProjectLoad": true
}

Call Stack

AxiosError.from main.js:447120:14
RedirectableRequest.handleRequestError main.js:448927:34
eventHandlers.<computed> main.js:295701:28
_Axios.request main.js:449792:41
async _OpenDesignerForLocalProject.createPanel main.js:470028:29
async openDesigner main.js:470449:3

What type of Logic App Is this happening in?

Consumption (Portal)

Are you experiencing a regression?

No response

Which operating system are you using?

Windows

Did you refer to the TSG before filing this issue? https://aka.ms/lauxtsg

Yes

Workflow JSON

Screenshots or Videos

No response

Environment

VS code version: 1.106.3.0

Additional context

Unable to open workflow in designer view.

[github-actions]

AI Triage Analysis

Component: VS Code Extension (Standard) | Priority: P1 | SKU: Standard (VS Code) — note: reporter selected "Consumption (Portal)" but call stack and extension action azureLogicAppsStandard.openDesigner clearly indicate a local Standard project in VS Code

Relevant Code

• apps/vs-code-designer/src/app/commands/workflows/openDesigner/openDesignerForLocalProject.ts:L117-L127 — createPanel() calls startDesignTimeApi(), then reads the port from ext.designTimeInstances. If the design-time process failed to start, the subsequent Axios call to localhost:8000 will get ECONNREFUSED.
• apps/vs-code-designer/src/app/utils/codeless/startDesignTimeApi.ts:L51-L120 — startDesignTimeApi() uses portfinder to pick a port, starts func host start --port <port>, and waits for the API to respond. Port 8000 appearing in the error suggests the design-time process either failed to start (func core tools issue) or crashed before the designer panel connected.

Probable Root Cause

The ECONNREFUSED 127.0.0.1:8000 error occurs when createPanel() in OpenDesignerForLocalProject attempts to reach the local design-time API but Azure Functions Core Tools failed to launch or crashed immediately. Port 8000 is the likely port selected by portfinder, but the func host start process did not bind to it — often caused by a missing/broken Azure Functions Core Tools installation, a conflicting process on port 8000, or a startup error in the local logic app runtime (e.g., missing extension bundle, misconfigured local.settings.json).

Suggested Investigation

1. Check the Azure Logic Apps (Standard) output channel in VS Code for func host startup errors (e.g., missing extension bundle, config errors, port conflicts).
2. Verify Azure Functions Core Tools are installed and working: run func --version in a terminal. The setting validateFuncCoreTools: true is enabled, so check if validation passes.
3. Confirm the extension bundle version 1.160.21 is fully downloaded to C:\Users\sadanandan.varadhara\.azurelogicapps\dependencies — an incomplete download can cause host startup failure.
4. Try manually killing any process on port 8000 (netstat -ano | findstr :8000), then retry opening the designer.

Similar Issues

• logic app designer issues vs code ide #6472 — "logic app designer issues vs code ide" (closed/completed) — same ECONNREFUSED pattern; resolved by fixing func core tools / port conflicts
• Issue in starting logic app designer #5868 — "Issue in starting logic app designer" (closed/not planned) — identical error, insufficient repro info

⚠️ Missing info: Repro steps in the issue body are blank. Please provide: (1) steps to reproduce, (2) output from the Azure Logic Apps output channel, (3) result of func --version in terminal.

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Automated analysis by issue triage agent. May contain inaccuracies — verify before acting.
Calibration: reviewed 2 past similar issues (#6472, #5868), 0 label corrections identified — VSCode label consistently applied to this error pattern.

Generated by Issue Triage Agent for Azure Logic Apps UX for issue #9029 · ◷

[github-actions]

We requested more information to triage this issue. If the issue goes more than 7 days with no more information it'll be automatically closed.