Debug Azure Function (Python) in VSCode and RuntimeError: Can't listen for client connections: [WinError 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted python in vs code

Achraf DRIDI 76

Hi, I'm trying to run an azure function app locally(python) that helps deploy ML model but I got this error. I debugged before other function apps locally and they worked fine . I tried to debug it with the command " func host start --port (different port) and the function restart all by itself and get the same white description in the screenshot " info: Grpc.AspNetCore.Server.ServerCallHandler[14] Error reading message. System.IO.IOException: The request stream was aborted...." ![197776-image.png][1] [1]: /api/attachments/197776-image.png?platform=QnA

casgiedus 0 Reputation points

2024-01-26T12:01:52.59+00:00

I had a similar problem, for me it was resolved when I removed the http_proxy environment variable I had set

1 answer

VenkateshDodda-MSFT 18,696 Reputation points Microsoft Employee

2022-05-02T05:18:14.537+00:00

anonymous user, Thanks for reaching out. Function invocations are evenly distributed among language worker processes. Language worker processes are spawned every 10 seconds until the count set by FUNCTIONS_WORKER_PROCESS_COUNT is reached. Could you please add this app settings FUNCTIONS_WORKER_PROCESS_COUNT to your local.settings.json file and try to run the function app again.

Feel free to reach back to me if you have any further questions.
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1 person found this answer helpful.
Kiril Nikolov 1 Reputation point

2022-10-06T17:50:10.37+00:00

Hi Venkatesh,

The same issue occurred for me too.

What should we actually input into the local.settings.json file? And what should the value for the worker process count be?
Something like this?

"FUNCTIONS_WORKER_PROCESS_COUNT" : 1

Many thanks

Ryan LaPlante 1 Reputation point

2022-12-28T18:14:31.68+00:00

I am seeing this as well with an Azure Function executing locally. The function is fine without the FUNCTIONS_WORKER_PROCESS_COUNT setting (default is 1, I believe), but when I add FUNCTIONS_WORKER_PROCESS_COUNT = 2, the error occurs.

Anurag Dhuria (CA) 0 Reputation points

2023-02-01T19:48:23.2366667+00:00

I'm getting this error here [WinError 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted

Anurag Dhuria (CA) 0 Reputation points

2023-02-01T19:49:04.1166667+00:00

[WinError 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted I'm also getting this error, any idea how to resolved this ?

Richard Brown 5 Reputation points

2023-08-17T12:44:30.5766667+00:00

Same error for me, doesn't matter if I include FUNCTIONS_WORKER_PROCESS_COUNT or not, or what value I assign to it if included. The app fails immediately with

"Can't listen for client connections: [WinError 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted"

no one 1 Reputation point

2023-08-17T14:36:05.0033333+00:00

@VenkateshDodda-MSFT
This issue is neither clear nor solved. Could you please be so kind and answer the questions here?
Simply taking over 2 sentences via copy&paste is not enough here. Maybe you don't understand how to use it yourself?

Richard Brown 5 Reputation points

2023-08-23T19:40:05.4033333+00:00

Not sure what you mean sorry. I'm not answering the question, I'm reporting the same error in my own function app. No copy and paste, try reading messages in future then maybe you'll understand how to use it.

no one 1 Reputation point

2023-08-24T06:00:26.3266667+00:00

I posted my message AFTER you. Not FOR you.
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