Azure Function: No such host is known Storage Account

Question

Azure Function: No such host is known Storage Account

Jesus Orlando Aguilar Contreras 120

Hi everyone,

I have 2 Azure functions with VNet integration, and each of them has its own storage account. The first function is fine, but the second one generates this error when integrated into a network: Azure.Core: No such host is known. ([MyStorage].blob.core.windows.net:443). System.Net.Http: No such host is known. ([MyStorage].blob.core.windows.net:443). System.Net.Sockets: No such host is known.

I have no idea why, when integrating the function into a virtual network, it suddenly doesn't recognize the storage host, even though the storage has public access.

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Has this happened to you? I would appreciate if you could provide guidance.

Thank you

VenkateshDodda-MSFT 25,111 Reputation points Microsoft Employee Moderator

2023-05-29T04:36:49.2966667+00:00

Hello @Jesus Orlando Aguilar Contreras ,

I hope the answer helps. Please let me know if you have any further queries.

Please accept as Yes if the answer provided is useful, so that you can help others in the community looking for remediation for similar issues.
Lamia Elshahat Eldesoky 76 Reputation points

2023-05-29T04:56:12.52+00:00

Me too
Jesus Orlando Aguilar Contreras 120 Reputation points

2023-05-30T14:24:24.41+00:00

Hi @VenkateshDodda-MSFT , thank you for the help in resolving the issue.

We were reviewing it and realized that the network the Azure function was on was not reaching the private DNS we are using. So, we added a public DNS to the network while troubleshooting the problem. The strange thing about this is that one of the functions, even though it couldn't connect to the storage, was not failing.

In other words, it seemed that it wasn't generating the error, while the other function did. It was something odd

3 answers

Your answer

VenkateshDodda-MSFT 25,111 Reputation points Microsoft Employee Moderator

2023-05-29T04:36:49.2966667+00:00

Hello @Jesus Orlando Aguilar Contreras ,

I hope the answer helps. Please let me know if you have any further queries.

Please accept as Yes if the answer provided is useful, so that you can help others in the community looking for remediation for similar issues.
Lamia Elshahat Eldesoky 76 Reputation points

2023-05-29T04:56:12.52+00:00

Me too
Jesus Orlando Aguilar Contreras 120 Reputation points

2023-05-30T14:24:24.41+00:00

Hi @VenkateshDodda-MSFT , thank you for the help in resolving the issue.

We were reviewing it and realized that the network the Azure function was on was not reaching the private DNS we are using. So, we added a public DNS to the network while troubleshooting the problem. The strange thing about this is that one of the functions, even though it couldn't connect to the storage, was not failing.

In other words, it seemed that it wasn't generating the error, while the other function did. It was something odd

Answer 1

@Jesus Orlando Aguilar Contreras Thank you for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.

As per the error message "Azure.Core: No such host is known. ([MyStorage].blob.core.windows.net:443). System.Net.Http: No such host is known." it looks like you function is communicating with storage account and not able to communicate.

I have looked into the backend logs and I can see the same behavior that your function is not able to communicate with storage account I have further looked into the latest logs and I could see that your function is able to communicate with the storage account.

I believe you storage account might be in virtual network or there might be any access restriction configured and which would have caused this issue. Do let me know if you are still facing the issue.

Feel free to reach back to me if you have any further questions on this.

Darshan Sagar 0 Reputation points

2024-10-21T06:39:02.8766667+00:00

Hey @VenkateshDodda-MSFT even i am facing the same issue would please help us to resolve this and one more issue is even though making changes in the host file we are facing this issue

Answer 2

Aninda Basu 10 Microsoft Employee

Hey, we are also facing he same issue with the Logic App inside the ASE and it is not able to connect to the hosting storage. Although, when the logic app is outside the ASE, it is able to resolve and connect to the storage. The Virtual Network and the subnet is the same, which we have used inside and outside the ASE.

Error::

Azure.Core: No such host is known. (.blob.core.windows.net:443). System.Net.Http: No such host is known. (.blob.core.windows.net:443). System.Net.Sockets: No such host is known.

Amruta Deshmukh 0 Reputation points

2024-06-18T09:36:54.96+00:00

i have same issue..what is resolution?

Answer 3

Richard Jackson 91

I'm currently having the same issue, running an Azure Function (Durable, C#, .NET 8.0) locally and attempting to use an Azure-hosted blob storage account. The connection will timeout after about 60 seconds.

Azure.Core: No such host is known. ([URI].queue.core.windows.net:443). System.Net.Http: No such host is known. ([URI].queue.core.windows.net:443). System.Net.Sockets: No such host is known.

Any guidance would be greatly appreciated!

Thanks,

Rich

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Azure Function: No such host is known Storage Account

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