The listener for function 'name' was unable to start.

Question

The listener for function 'name' was unable to start.

Nguyen Thuan An 21

Hello everyone, I tried to run Azure Function Event Hub trigger on my laptop but I got this error

After that I changed AzureWebJobsStorage value in local.settings.json file from
"UseDevelopmentStorage=true" => "DefaultEndpointsProtocol" from AzureWebJobsStorage in Configuration (I read a post from stackoverflow)

Now I got more error :(

Can someone point out where I'm doing wrong? Thanks

MayankBargali-MSFT 71,011 Reputation points Moderator

2022-12-21T08:27:03.147+00:00

@Nguyen Thuan An Thanks for reaching out. As per the error the entity path was not valid iothub-ns-ansampleio-23431148-f707f82b53.servicebus.windows.net/messages/events. Please validate whether you are passing the eventHubName and consumerGroup properties correctly as documented here.

Let me know if you are still facing the issue.
Nguyen Thuan An 21 Reputation points

2022-12-21T10:45:54.56+00:00

hello Mr. @MayankBargali-MSFT , I had create new Azure Function Event Hub trigger

I don't change any code when create but it still get error
Nguyen Thuan An 21 Reputation points

2022-12-23T02:32:06.273+00:00

Mr. @MayankBargali-MSFT , can you help me to fix this error or let me know how to observe messages from Azure, thank you.
Nguyen Thuan An 21 Reputation points

2023-04-26T10:51:09.5566667+00:00

Hello Mr. @MayankBargali-MSFT , sorry to bother you, but can we continue this question? If this question can not resolve, could you let me know the other way to receive message from simulator device send to IoT Hub? Thank you!

1 answer

Your answer

MayankBargali-MSFT 71,011 Reputation points Moderator

2022-12-21T08:27:03.147+00:00

@Nguyen Thuan An Thanks for reaching out. As per the error the entity path was not valid iothub-ns-ansampleio-23431148-f707f82b53.servicebus.windows.net/messages/events. Please validate whether you are passing the eventHubName and consumerGroup properties correctly as documented here.

Let me know if you are still facing the issue.
Nguyen Thuan An 21 Reputation points

2022-12-21T10:45:54.56+00:00

hello Mr. @MayankBargali-MSFT , I had create new Azure Function Event Hub trigger

I don't change any code when create but it still get error
Nguyen Thuan An 21 Reputation points

2022-12-23T02:32:06.273+00:00

Mr. @MayankBargali-MSFT , can you help me to fix this error or let me know how to observe messages from Azure, thank you.
Nguyen Thuan An 21 Reputation points

2023-04-26T10:51:09.5566667+00:00

Hello Mr. @MayankBargali-MSFT , sorry to bother you, but can we continue this question? If this question can not resolve, could you let me know the other way to receive message from simulator device send to IoT Hub? Thank you!

Answer 1

MayankBargali-MSFT 71,011 Moderator

@Nguyen Thuan An You need to update the sample-workitems with the correct eventhub name that is created on your event hub namespace for which you want to trigger your function.

You can navigate to your event hub resource in azure portal and then navigate to Event Hubs under the entity of your namespace. Now it will list the number of event hubs that are present on your namespace.

As you can see in my namespace there are multiple eventhubs and I have used iotevents hub in the configuration of my azure app. Similarly you need to update the right eventhub name for your namespace.

The error is expected as the event hub name is incorrect and doesn't exists in your namespace. Feel free to get back to me if you need any assistance.

Please 'Accept as answer' and ‘Upvote’ if it helped so that it can help others in the community looking for help on similar topics.

Anonymous

2022-12-27T09:19:28.963+00:00

Hello Mr. @MayankBargali-MSFT ,

I created Event Hubs

and connect it to IoT Hub though Message Routing

it still getting error, did I do it right?
thank you for support me!
MayankBargali-MSFT 71,011 Reputation points Moderator

2022-12-28T05:38:25.86+00:00

@Anonymous As pe the screenshot the your namespace is ansecondeventhub and sample-workitems as the event hub name. But as per the error you are connecting to iothub-ns-ansampleio-23431148-f707f82b53. In your first screenshot you are under the event hub namespace blade where you see the Shared access policies under settings. Please navigate to that option and click on RootManageSharedAccessKey (i.e. the default key or create new one as per your need) and copy connection string (primary or secondary). Now navigate to your local.settings.json and update this value for the property EventHubConnectionString

Let me know if you are still facing the issue and we can connect offline so I can assist you.
Anonymous

2022-12-29T03:11:53.783+00:00

thanks Mr. @MayankBargali-MSFT , the previous error is not happen any more but now I get this error

my teacher said that Azure Func doesn't have localhost to connect, this is weird and maybe there is some code use tcpclient in my project, but this is new file when I create project and not edit anything
MayankBargali-MSFT 71,011 Reputation points Moderator

2022-12-29T08:57:44.323+00:00
@Anonymous Your new issue is already discussed here. Upde your AzureWebJobsStorage with some other port in your local.settings.json

"AzureWebJobsStorage": "DefaultEndpointsProtocol=http;AccountName=devstoreaccount1;AccountKey=<<key>>;BlobEndpoint=http://127.0.0.1:20000/devstoreaccount1;QueueEndpoint=http://127.0.0.1:20001/devstoreaccount1;TableEndpoint=http://127.0.0.1:20002/devstoreaccount1;",

Feel free to "Accept as Answer" if your initial issue is resolved so it can help other community member facing the similar issue.
Anonymous

2022-12-29T09:32:29.777+00:00

Mr. @MayankBargali-MSFT I updated AzureWebJobsStorage as you said but it change IP error from 127.0.0.1:10000 to 127.0.0.1:20000

my AzureStorageEmulator.exe.config
Anonymous

2023-01-03T03:08:00.647+00:00

Hello Mr. @MayankBargali-MSFT , have a nice day.

Is the error I'm getting can be fixed, if not, can you let me know another way to receive message from Azure and log it.

Thank you very much!
MayankBargali-MSFT 71,011 Reputation points Moderator

2023-01-04T09:38:49.377+00:00
@Anonymous You need to make two changes as discussed here.
Navigate to the C:\Program Files (x86)\Microsoft SDKs\Azure\Storage Emulator directory (i.e the directory where your emulator is installed) and open the AzureStorageEmulator.exe.config file and update the ports to the default port as the function try to find the storage emulator services in the default IP and port. Change the port to any other port let's say 30001,30002,30003

<services> <service name="Blob" url="http://127.0.0.1:30000/"/> <service name="Queue" url="http://127.0.0.1:30001/"/> <service name="Table" url="http://127.0.0.1:30002/"/> </services>

Now at your local.settings.json for every function that you will be running locally. You can modify the ports as per your need i.e. the ports where your storage service is running. The same is documented here on how you can use the other value instead of UseDevelopmentStorage=true

"AzureWebJobsStorage": "DefaultEndpointsProtocol=http;AccountName=youraccount;AccountKey=yourkey;BlobEndpoint=http://127.0.0.1:30000/devstoreaccount1;QueueEndpoint=http://127.0.0.1:30001/devstoreaccount1;TableEndpoint=http://127.0.0.1:30002/youraccount;",
Nguyen Thuan An 21 Reputation points

2023-01-05T04:07:52.21+00:00

@MayankBargali-MSFT , I updated the ports and AzureWebJobsStorage but the error still change to the ports I updated
Nguyen Thuan An 21 Reputation points

2023-01-05T11:04:10.04+00:00

@MayankBargali-MSFT , is this "devstoreaccount1" right?, if not where I can find "youraccount", it is "Subscription ID", "Subscription Name" or something else.
thank you so much for continue support me
Nguyen Thuan An 21 Reputation points

2023-04-26T10:47:23.9+00:00

Hello Mr. @MayankBargali-MSFT , sorry to bother you, but can we continue the question?
If this question can not be resolve, could you let me know the other way to send from simulator device and receive that message.
Thank you!
MayankBargali-MSFT 71,011 Reputation points Moderator

2023-04-27T03:05:00.82+00:00

@Nguyen Thuan An Please send an email with subject line “Attn:Mayank” to AzCommunity[at]Microsoft[dot]com referencing this thread along with your availability so I can connect with you to resolve the issue.
Nguyen Thuan An 21 Reputation points

2023-05-09T08:53:14.79+00:00

Hello Mr. @MayankBargali-MSFT , I sent an email as you said.

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The listener for function 'name' was unable to start.

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