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- You need to switch your app to a container app deployment, create a /tmp/test directory in your image and then configure your temp-space share mount to that directory. You can also switch to a Linux hosting plan, but it is advised that you don't map to /tmp or any subdirectories as that could lead to timeouts during app startup.
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Verify you have the latest Azure File Sync agent version installed and give the Microsoft.StorageSync application access to the storage account (see Ensure Azure File Sync has access to the storage account). Sync failed due to firewall and virtual network exception not configured
Apr 28, 2024 · Solution for cause 2. Browse to the storage account in which the Azure file share is located, select Access control (IAM), and verify that your user account has access to the storage account. To learn more, see How to secure your storage account with Azure role-based access control (Azure RBAC).
- Overview
- Protect your access keys
- Store a connection string
- Configure a connection string for Azurite
- Configure a connection string for an Azure storage account
- Create a connection string using a shared access signature
- Create a connection string for an explicit storage endpoint
- Authorizing access with Shared Key
- Next steps
A connection string includes the authorization information required for your application to access data in an Azure Storage account at runtime using Shared Key authorization. You can configure connection strings to:
•Connect to the Azurite storage emulator.
•Access a storage account in Azure.
•Access specified resources in Azure via a shared access signature (SAS).
Storage account access keys provide full access to the configuration of a storage account, as well as the data. Always be careful to protect your access keys. Use Azure Key Vault to manage and rotate your keys securely. Access to the shared key grants a user full access to a storage account’s configuration and its data. Access to shared keys should be carefully limited and monitored. Use SAS tokens with limited scope of access in scenarios where Microsoft Entra ID based authorization can't be used. Avoid hard-coding access keys or saving them anywhere in plain text that is accessible to others. Rotate your keys if you believe they might have been compromised.
Important
Microsoft recommends using Microsoft Entra ID to authorize requests against blob, queue, and table data if possible, rather than using the account keys (Shared Key authorization). Authorization with Microsoft Entra ID provides superior security and ease of use over Shared Key authorization. For more information about using Microsoft Entra authorization from your applications, see How to authenticate .NET applications with Azure services. For SMB Azure file shares, Microsoft recommends using on-premises Active Directory Domain Services (AD DS) integration or Microsoft Entra Kerberos authentication.
To prevent users from accessing data in your storage account with Shared Key, you can disallow Shared Key authorization for the storage account. Granular access to data with least privileges necessary is recommended as a security best practice. Microsoft Entra ID based authorization should be used for scenarios that support OAuth. Kerberos or SMTP should be used for Azure Files over SMB. For Azure Files over REST, SAS tokens can be used. Shared key access should be disabled if not required to prevent its inadvertent use. For more information, see Prevent Shared Key authorization for an Azure Storage account.
To protect an Azure Storage account with Microsoft Entra Conditional Access policies, you must disallow Shared Key authorization for the storage account.
If you have disabled shared key access and you are seeing Shared Key authorization reported in the diagnostic logs, this indicates that trusted access is being used to access storage. For more details, see Trusted access for resources registered in your subscription.
Your application needs to access the connection string at runtime to authorize requests made to Azure Storage. You have several options for storing your account access keys or connection string:
•You can store your account keys securely in Azure Key Vault. For more information, see About Azure Key Vault managed storage account keys.
•You can store your connection string in an environment variable.
•An application can store the connection string in an app.config or web.config file. Add the connection string to the AppSettings section in these files.
Warning
Storing your account access keys or connection string in clear text presents a security risk and is not recommended. Store your account keys in an encrypted format, or migrate your applications to use Microsoft Entra authorization for access to your storage account.
The emulator supports a single fixed account and a well-known authentication key for Shared Key authentication. This account and key are the only Shared Key credentials permitted for use with the emulator. They are:
Connect to the emulator account using the shortcut
The easiest way to connect to the emulator from your application is to configure a connection string in your application's configuration file that references the shortcut UseDevelopmentStorage=true. The shortcut is equivalent to the full connection string for the emulator, which specifies the account name, the account key, and the emulator endpoints for each of the Azure Storage services:
The following .NET code snippet shows how you can use the shortcut from a method that takes a connection string. For example, the BlobContainerClient(String, String) constructor takes a connection string.
Make sure that the emulator is running before calling the code in the snippet.
For more information about Azurite, see Use the Azurite emulator for local Azure Storage development.
To create a connection string for your Azure storage account, use the following format. Indicate whether you want to connect to the storage account through HTTPS (recommended) or HTTP, replace myAccountName with the name of your storage account, and replace myAccountKey with your account access key:
DefaultEndpointsProtocol=[http|https];AccountName=myAccountName;AccountKey=myAccountKey
For example, your connection string might look similar to:
DefaultEndpointsProtocol=https;AccountName=storagesample;AccountKey=
If you possess a shared access signature (SAS) URL that grants you access to resources in a storage account, you can use the SAS in a connection string. Because the SAS contains the information required to authenticate the request, a connection string with a SAS provides the protocol, the service endpoint, and the necessary credentials to access the resource.
To create a connection string that includes a shared access signature, specify the string in the following format:
You can specify explicit service endpoints in your connection string instead of using the default endpoints. To create a connection string that specifies an explicit endpoint, specify the complete service endpoint for each service, including the protocol specification (HTTPS (recommended) or HTTP), in the following format:
One scenario where you might wish to specify an explicit endpoint is when you've mapped your Blob storage endpoint to a custom domain. In that case, you can specify your custom endpoint for Blob storage in your connection string. You can optionally specify the default endpoints for the other services if your application uses them.
Here is an example of a connection string that specifies an explicit endpoint for the Blob service:
This example specifies explicit endpoints for all services, including a custom domain for the Blob service:
The endpoint values in a connection string are used to construct the request URIs to the storage services, and dictate the form of any URIs that are returned to your code.
If you've mapped a storage endpoint to a custom domain and omit that endpoint from a connection string, then you will not be able to use that connection string to access data in that service from your code.
To learn how to authorize access to Azure Storage with the account key or with a connection string, see one of the following articles:
•Authorize access and connect to Blob Storage with .NET
•Authorize access and connect to Blob Storage with Java
•Authorize access and connect to Blob Storage with JavaScript
•Grant limited access to Azure Storage resources using shared access signatures (SAS)
•Use the Azurite emulator for local Azure Storage development
Mar 9, 2021 · Your app service is allowed to access the storage account. You can either do this using a Managed identity or a Shared Access Signature. See this link for using managed identity: https://learn.microsoft.com/en-us/azure/app-service/scenario-secure-app-access-storage?tabs=azure-portal%2Ccommand-line
Dec 7, 2020 · You are not able to access your storage account from a Virtual Machine, which is part of the VNet, already authorized in storage accounts Firewall and virtual networks. When trying to download a file, we see the following error message. Actions: For this issue we will use the storage diagnostics logs enabled on our storage account.
Sep 25, 2017 · Specify the Azure Storage Account name created in the Azure Portal and the Account key. The account key can be the key1 or key2 that we saw in the Azure Portal in the Access Keys section: A common error is that the Authentication failed for account xxx and the provider key.
Jun 5, 2019 · To persist an SMB connection with Azure File Share under the SYSTEM account, you need to open a PowerShell session as Administrator, and then run the New-SMBGlobalMapping cmdlet as shown below (make sure to change the storage account name, file share name, username, and password):
