VSCode python debugger fails to attach to local port with ECONNREFUSED

Question

I'm trying to debug locally a project that is deployed on Microsoft Azure.

I have a copy of the repository on my PC and setup the launch.json file as:

{
    "version": "0.2.0",
    "configurations": [


        {
            "name": "Attach to Python Functions",
            "type": "python",
            "request": "attach",
            "port": 9091,
            "preLaunchTask": "func: host start",
            "justMyCode": false,
        }
    ]
}

This has been working for days, but today is suddenly giving me problems. When in VSCode I click "Start debugging" I can see VSCode opening a new terminal, installing the dependencies specified in the virtual environment and executing func: host start as requested.

However, without a clear reason, today VSCode started showing an error message saying

connect ECONNREFUSED 127.0.0.1:9091

How can I fix this?

PS: I'm not an expert of VSCode, so please let me know if I omitted any useful information and I will add it.

Answer 1

I have been receiving the same error quite a few times while I'm trying to run the azure function from Run -> Run without Debugging One of the workarounds that worked for me is to use the command func host start from the terminal.

Alternatively, you can update the .vscode/tasks.json file. For more information on this, you can check VSCode is not starting Func Host Start properly