how to access azure storage account using private endpoint via azure P2S

$@chin 115 Reputation points
2024-06-19T16:13:30.1966667+00:00

hi,

A scenario where a client is using Point-to-Site connectivity and attempting to connect to an Azure Storage account through its private endpoint, the issue arises when the Storage account FQDN resolves to a public IP instead of the private endpoint IP. This results in a situation where users trying to connect using Storage Explorer encounter the error message: 'This request is not authorized to perform this operation without using the ER or S2S tunnel.

Can this be achieved using P2S ?

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Accepted answer
  1. KapilAnanth-MSFT 41,071 Reputation points Microsoft Employee
    2024-06-24T06:01:10.07+00:00

    @$@chin ,

    Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

    I understand that you have a requirement that P2S users have to connect a Storage Account's private endpoint.

    Silvia Wibowo's suggestion is correct.

    • Adding Add DNS suffixes would make the DNS requests for *.blob.core.windows.net go via the P2S Tunnel
    • However, just using the DNS Suffixes is not enough.
    • You should also use a custom DNS server in Azure if you want Private endPoints to be resolved.
      • This means, you should have a VM acting as DNS Server located in Azure VNET where the VPN Gateway is deployed.
      • In addition, the VM DNS Server should have a forward lookup zone for "blob.core.windows.net" and forward the requests to Azure Wireserver IP - 168.63.129.16.
    • You may wonder why you cannot directly forward the requests to 168.63.129.16 without ever deploying a VM DNS Server
      • The answer is that 168.63.129.16 is a virtual IP and it will accept only DNS queries from VMs in Azure
      • Not directly from P2S Clients.
    • See : Use a DNS forwarder VM
      • User's image
      Steps 1 and 2 are done by Add DNS suffixes and custom DNS server

    The recommended method is to use Azure DNS Private Resolver instead, which can act as a DNS VM in Azure and has less management overhead.

    For non-production scenarios,

    Kindly let us know if this helps or you need further assistance on this issue.

    Thanks,

    Kapil


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  1. Silvia Wibowo 3,571 Reputation points Microsoft Employee
    2024-06-20T02:29:50.0566667+00:00

    Hi @$@chin , I understand that you're having issues connecting to Azure Storage private endpoint via VPN P2S.

    Modify the downloaded profile XML file (for Azure P2S Client) and add these tags:

    <dnssuffixes> <dnssuffix>.privatelink.blob.core.windows.net </dnssuffix> </dnssuffixes>

    Reference: Add DNS suffixes

    If <dnssuffix>.privatelink.blob.core.windows.net</dnssuffix> does not work, try <dnssuffix>.blob.core.windows.net</dnssuffix>

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