Azure Functions
An Azure service that provides an event-driven serverless compute platform.
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Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature
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SAI BABA BOJJA
1
Reputation point
I have a function app which triggers on an event and is integrated with application insights and storage account. Function app is VNET integrated and the same VNET is added to storage account for whitelisting. But in the log stream of function app, I see the following error:
[Verbose] Host instance '<instance_id>' failed to acquire host lock lease: Azure.Storage.Blobs: Service request failed.
Status: 403 (Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature.)
ErrorCode: AuthenticationFailed
Headers:
Transfer-Encoding: chunked
Server: Microsoft-HTTPAPI/2.0
x-ms-request-id: f671f24d-901e-0041-09b7-10c78c000000
x-ms-error-code: AuthenticationFailed
Date: Thu, 15 Dec 2022 19:01:23 GMT
Not sure what is wrong. I have added app settings AzureWebJobsStorage and added latest storage account connection string but still getting same issue.
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cleon williams 1 Reputation point2022-12-15T21:17:44.9+00:00 I'm not sure how you have the function app setup with inputs or triggers, but you havent said if the code + test is giving the desired output to know if the function app is working. As for connecting a blob storage, try choosing azure blob storage as binding type. Next you'll need to configure the blob parameter name, then the path which is normally "parameter_name/location" . A storage account connection should be shown, or you choose new to make a new one. I'd recommend making it before.
The other method you mentioned of vnet connecting to storage sounds like a service principal is needed. -
SAI BABA BOJJA 1 Reputation point
2022-12-15T21:50:48.453+00:00 It is an eventhub triggered function and it is working fine, is able to consume messages. But I see the error when I go to log stream.
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MayankBargali-MSFT 70,936 Reputation points Moderator2022-12-19T06:08:11.57+00:00 @SAI BABA BOJJA Thanks for reaching out. If the issue is intermittent, then this could be the network issue or service issue which would have resulted in this error, and it would not be possible to pinpoint the root cause without looking into the backend logs what was happening during that time. If you have a support plan, then I will suggest you to open a support ticket with us to review this further. If you don't have the support plan then please let me know so I can help with you one time free support request on your subscription.
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cleon williams 1 Reputation point
2022-12-19T15:03:34.08+00:00 
This is how i had a blob storage setup for a similar test project.
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SAI BABA BOJJA 1 Reputation point
2022-12-20T19:42:48.297+00:00 Let me explain the things along with the pictures of my function app.
My function is having a trigger (eventhub) with no input and output. Whenever there is message in the eventhub, my function app is getting triggered, processing the message and writing the message to Azure SQL DB. Function app is integrated with VNET and the same is whitelisted in storage account as well as Azure SQL.
The storage account, which is integrated with the function app, is getting updated with message details like, message offset, sequence number etc., in a container.
We have application insights integrated and I can see traces and requests in the application insights logs.
But when I go to log streams in my function app, I see authentication failed error when I choose App insights logs. And no error if I choose filesystem logs.
Not sure where the issue is.
Let me know if you need any other information. -
cleon williams 1 Reputation point
2022-12-21T15:37:49.89+00:00 Try adding the blob storage as an output of the function app. if you are parsing the message from eventhub within the function app and want the output sent to a blob storage, you can either define an out object in the code, and use the out object as the blob parameter name to send to the blob storage Output. You can also set the blob parameter name to $return to send the entire standard output of the function app to the blob storage. If you already have the storage account configured, I would choose the storage account from from the storage account connection dropdown.
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SAI BABA BOJJA 1 Reputation point
2022-12-27T20:22:23.537+00:00 @MayankBargali-MSFT any information on the above ask. I have given the details in my comment above. Please let me know if you need any other information.
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MayankBargali-MSFT 70,936 Reputation points Moderator
2022-12-28T05:20:48.427+00:00 @SAI BABA BOJJA It would not be possible to provide the cause of the issue without looking into the logs as I mentioned previously. I will suggest to open a support ticket with us to review this further. If you don't have the support plan, then please refer to my private comment so I can enable one time free support request on your subscription.
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