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This article lists common problems that are related to Microsoft Azure Files when you connect from Windows clients. It also provides possible causes and resolutions for these problems. In addition to the troubleshooting steps in this article, you can also use AzFileDiagnostics to ensure that the Windows client environment has correct prerequisites. AzFileDiagnostics automates detection of most of the symptoms mentioned in this article and helps set up your environment to get optimal performance. You can also find this information in the Azure Files shares Troubleshooter that provides steps to assist you with problems connecting/mapping/mounting Azure Files shares.
When you try to mount a file share, you might receive the following error:
For security reasons, connections to Azure file shares are blocked if the communication channel isn't encrypted and if the connection attempt isn't made from the same datacenter where the Azure file shares reside. Unencrypted connections within the same datacenter can also be blocked if the Secure transfer required setting is enabled on the storage account. An encrypted communication channel is provided only if the user's client OS supports SMB encryption.
Jang ok jung korean history. Windows 8, Windows Server 2012, and later versions of each system negotiate requests that include SMB 3.0, which supports encryption.
If virtual network (VNET) and firewall rules are configured on the storage account, network traffic will be denied access unless the client IP address or virtual network is allowed access.
Verify virtual network and firewall rules are configured properly on the storage account. To test if virtual network or firewall rules is causing the issue, temporarily change the setting on the storage account to Allow access from all networks. To learn more, see Configure Azure Storage firewalls and virtual networks.
If users are accessing the Azure file share using Active Directory (AD) or Azure Active Directory Domain Services (Azure AD DS) authentication, access to the file share will fail with 'Access is denied' error if share-level permissions are incorrect.
To update the share-level permissions, see Assign access permissions to an identity.
When you try to mount a file share from on-premises or from a different datacenter, you might receive the following errors:
System error 53 or system error 67 can occur if port 445 outbound communication to an Azure Files datacenter is blocked. To see the summary of ISPs that allow or disallow access from port 445, go to TechNet.
To check if your firewall or ISP is blocking port 445, use the AzFileDiagnostics tool or Test-NetConnection
cmdlet.
To use the Test-NetConnection
cmdlet, the Azure PowerShell module must be installed, see Install Azure PowerShell module for more information. Remember to replace <your-storage-account-name>
and <your-resource-group-name>
with the relevant names for your storage account.
If the connection was successful, you should see the following output:
Note
The above command returns the current IP address of the storage account. This IP address is not guaranteed to remain the same, and may change at any time. Do not hardcode this IP address into any scripts, or into a firewall configuration.
Azure File Sync can transform your on-premises Windows Server into a quick cache of your Azure file share. You can use any protocol that's available on Windows Server to access your data locally, including SMB, NFS, and FTPS. Azure File Sync works over port 443 and can thus be used as a workaround to access Azure Files from clients that have port 445 blocked. Learn how to setup Azure File Sync.
By Setting up a VPN to your specific Storage Account, the traffic will go through a secure tunnel as opposed to over the internet. Follow the instructions to setup VPN to access Azure Files from Windows.
Work with your IT department or ISP to open port 445 outbound to Azure IP ranges.
Azure Files also supports REST in addition to SMB. REST access works over port 443 (standard tcp). There are various tools that are written using REST API which enable rich UI experience. Storage Explorer is one of them. Download and Install Storage Explorer and connect to your file share backed by Azure Files. You can also use PowerShell which also user REST API.
System error 53 or system error 87 can occur if NTLMv1 communication is enabled on the client. Azure Files supports only NTLMv2 authentication. Having NTLMv1 enabled creates a less-secure client. Therefore, communication is blocked for Azure Files. Fruity loops 8 for mac.
To determine whether this is the cause of the error, verify that the following registry subkey is set to a value of 3:
HKLMSYSTEMCurrentControlSetControlLsa > LmCompatibilityLevel
For more information, see the LmCompatibilityLevel topic on TechNet.
Revert the LmCompatibilityLevel value to the default value of 3 in the following registry subkey:
HKLMSYSTEMCurrentControlSetControlLsa
Error 1816 happens when you reach the upper limit of concurrent open handles that are allowed for a file on the computer where the file share is being mounted.
Reduce the number of concurrent open handles by closing some handles, and then retry. For more information, see Microsoft Azure Storage performance and scalability checklist.
To view open handles for a file share, directory or file, use the Get-AzStorageFileHandle PowerShell cmdlet.
To close open handles for a file share, directory or file, use the Close-AzStorageFileHandle PowerShell cmdlet.
Note
The Get-AzStorageFileHandle and Close-AzStorageFileHandle cmdlets are included in Az PowerShell module version 2.4 or later. To install the latest Az PowerShell module, see Install the Azure PowerShell module.
When you try to access or delete an Azure file share in the portal, you may receive the following error:
No access
Error code: 403
Verify virtual network and firewall rules are configured properly on the storage account. To test if virtual network or firewall rules is causing the issue, temporarily change the setting on the storage account to Allow access from all networks. To learn more, see Configure Azure Storage firewalls and virtual networks.
Browse to the storage account where the Azure file share is located, click Access control (IAM) and verify your user account has access to the storage account. To learn more, see How to secure your storage account with Role-Based Access Control (RBAC).
When you try to delete a file, you may receive the following error:
The specified resource is marked for deletion by an SMB client.
This issue typically occurs if the file or directory has an open handle.
If the SMB clients have closed all open handles and the issue continues to occur, perform the following:
Use the Get-AzStorageFileHandle PowerShell cmdlet to view open handles.
Use the Close-AzStorageFileHandle PowerShell cmdlet to close open handles.
Note
The Get-AzStorageFileHandle and Close-AzStorageFileHandle cmdlets are included in Az PowerShell module version 2.4 or later. To install the latest Az PowerShell module, see Install the Azure PowerShell module.
You might see slow performance when you try to transfer files to the Azure File service.
For clients that are running Windows 8.1 or Windows Server 2012 R2, make sure that the KB3114025 hotfix is installed. This hotfix improves the performance of create and close handles.
You can run the following script to check whether the hotfix has been installed:
reg query HKLMSYSTEMCurrentControlSetServicesLanmanWorkstationParametersPolicies
If hotfix is installed, the following output is displayed:
HKEY_Local_MACHINESYSTEMCurrentControlSetServicesLanmanWorkstationParametersPolicies {96c345ef-3cac-477b-8fcd-bea1a564241c} REG_DWORD 0x1
Note
Windows Server 2012 R2 images in Azure Marketplace have hotfix KB3114025 installed by default, starting in December 2015.
If you map an Azure file share as an administrator by using net use, the share appears to be missing.
By default, Windows File Explorer does not run as an administrator. If you run net use from an administrative command prompt, you map the network drive as an administrator. Because mapped drives are user-centric, the user account that is logged in does not display the drives if they are mounted under a different user account.
Mount the share from a non-administrator command line. Alternatively, you can follow this TechNet topic to configure the EnableLinkedConnections registry value.
The net use command interprets a forward slash (/) as a command-line option. If your user account name starts with a forward slash, the drive mapping fails.
You can use either of the following steps to work around the problem:
Run the following PowerShell command:
New-SmbMapping -LocalPath y: -RemotePath servershare -UserName accountName -Password 'password can contain / and etc'
From a batch file, you can run the command this way:
Echo new-smbMapping .. powershell -command –
Put double quotation marks around the key to work around this problem--unless the forward slash is the first character. If it is, either use the interactive mode and enter your password separately or regenerate your keys to get a key that doesn't start with a forward slash.
Drives are mounted per user. If your application or service is running under a different user account than the one that mounted the drive, the application will not see the drive.
Use one of the following solutions:
Mount the drive from the same user account that contains the application. You can use a tool such as PsExec.
Pass the storage account name and key in the user name and password parameters of the net use command.
Use the cmdkey command to add the credentials into Credential Manager. Perform this from a command line under the service account context, either through an interactive login or by using runas
.
cmdkey /add:<storage-account-name>.file.core.windows.net /user:AZURE<storage-account-name> /pass:<storage-account-key>
Map the share directly without using a mapped drive letter. Some applications may not reconnect to the drive letter properly, so using the full UNC path may be more reliable.
net use * storage-account-name.file.core.windows.netshare
After you follow these instructions, you might receive the following error message when you run net use for the system/network service account: 'System error 1312 has occurred. A specified logon session does not exist. It may already have been terminated.' If this occurs, make sure that the username that is passed to net use includes domain information (for example: '[storage account name].file.core.windows.net').
When a file is copied over the network, the file is decrypted on the source computer, transmitted in plaintext, and re-encrypted at the destination. However, you might see the following error when you're trying to copy an encrypted file: 'You are copying the file to a destination that does not support encryption.'
This problem can occur if you are using Encrypting File System (EFS). BitLocker-encrypted files can be copied to Azure Files. However, Azure Files does not support NTFS EFS.
To copy a file over the network, you must first decrypt it. Use one of the following methods:
Be aware that setting the registry key affects all copy operations that are made to network shares.
This problem can occur if there is no enough cache on client machine for large directories.
To resolve this problem, adjusting the DirectoryCacheEntrySizeMax registry value to allow caching of larger directory listings in the client machine:
For example, you can set it to 0x100000 and see if the performance become better.
Error AadDsTenantNotFound happens when you try to enable Azure Active Directory Domain Services (Azure AD DS) authentication on Azure Files on a storage account where AAD Domain Service(AAD DS) is not created on the AAD tenant of the associated subscription.
Enable AAD DS on the AAD tenant of the subscription that your storage account is deployed to. You need administrator privileges of the AAD tenant to create a managed domain. If you aren't the administrator of the Azure AD tenant, contact the administrator and follow the step-by-step guidance to Enable Azure Active Directory Domain Services using the Azure portal.
The ConditionHeadersNotSupported error occurs when accessing content hosted in Azure Files through an application that makes use of conditional headers, such as a web browser, access fails. The error states that condition headers are not supported.
Conditional headers are not yet supported. Applications implementing them will need to request the full file every time the file is accessed.
When a new file is uploaded, the cache-control property by default is “no-cache”. To force the application to request the file every time, the file's cache-control property needs to be updated from “no-cache” to “no-cache, no-store, must-revalidate”. This can be achieved using Azure Storage Explorer.
Error 'System error 1359 has occurred. An internal error' happens when you try to connect to your file share with AAD DS authentication enabled against an AAD DS with domain DNS name starting with a numeric character. For example, if your AAD DS Domain DNS name is '1domain', you will get this error when attempting to mount the file share using AAD credentials.
Currently, you can consider redeploying your AAD DS using a new domain DNS name that applies with the rules below:
First, make sure that you have followed through all four steps to enable Azure Files AD Authentication.
Second, try mounting Azure file share with storage account key. If you failed to mount, download AzFileDiagnostics.ps1 to help you validate the client running environment, detect the incompatible client configuration which would cause access failure for Azure Files, gives prescriptive guidance on self-fix and, collect the diagnostics traces.
Third, you can run the Debug-AzStorageAccountAuth cmdlet to conduct a set of basic checks on your AD configuration with the logged on AD user. This cmdlet is supported on AzFilesHybrid v0.1.2+ version. You need to run this cmdlet with an AD user that has owner permission on the target storage account.
The cmdlet performs these checks below in sequence and provides guidance for failures:
We are actively working on extending this diagnostics cmdlet to provide better troubleshooting guidance.
If you still need help, contact support to get your problem resolved quickly.