Azure Bastion FAQ

Do I need a public IP on my virtual machine to connect via Azure Bastion?

No. When you connect to a VM using Azure Bastion, you don't need a public IP on the Azure virtual machine that you are connecting to. The Bastion service will open the RDP/SSH session/connection to your virtual machine over the private IP of your virtual machine, within your virtual network.

Is IPv6 supported?

At this time, IPv6 is not supported. Azure Bastion supports IPv4 only.

Can I use Azure Bastion with Azure Private DNS Zones?

The use of Azure Bastion with Azure Private DNS Zones is not supported at this time. Before you deploy your Azure Bastion resource, please make sure that the host virtual network is not linked to a private DNS zone.

Do I need an RDP or SSH client?

No. You don't need an RDP or SSH client to access the RDP/SSH to your Azure virtual machine in your Azure portal. Use the Azure portal to let you get RDP/SSH access to your virtual machine directly in the browser.

Do I need an agent running in the Azure virtual machine?

No. You don't need to install an agent or any software on your browser or your Azure virtual machine. The Bastion service is agentless and doesn't require any additional software for RDP/SSH.

How many concurrent RDP and SSH sessions does each Azure Bastion support?

Both RDP and SSH are a usage-based protocol. High usage of sessions will cause the bastion host to support a lower total number of sessions. The numbers below assume normal day-to-day workflows.

Workload Type* Limit**
Light 100
Medium 50
Heavy 5

*These workload types are defined here: Remote Desktop workloads
**These limits are based on RDP performance tests for Azure Bastion. The numbers may vary due to other on-going RDP sessions or other on-going SSH sessions.

What features are supported in an RDP session?

At this time, only text copy/paste is supported. Features, such as file copy, are not supported. Feel free to share your feedback about new features on the Azure Bastion Feedback page.

Does Bastion hardening work with AADJ VM extension-joined VMs?

This feature doesn't work with AADJ VM extension-joined machines using Azure AD users. For more information, see Windows Azure VMs and Azure AD.

Which browsers are supported?

The browser must support HTML 5. Use the Microsoft Edge browser or Google Chrome on Windows. For Apple Mac, use Google Chrome browser. Microsoft Edge Chromium is also supported on both Windows and Mac, respectively.

Where does Azure Bastion store customer data?

Azure Bastion doesn't move or store customer data out of the region it is deployed in.

Are any roles required to access a virtual machine?

In order to make a connection, the following roles are required:

  • Reader role on the virtual machine
  • Reader role on the NIC with private IP of the virtual machine
  • Reader role on the Azure Bastion resource

What is the pricing?

For more information, see the pricing page.

Does Azure Bastion require an RDS CAL for administrative purposes on Azure-hosted VMs?

No, access to Windows Server VMs by Azure Bastion does not require an RDS CAL when used solely for administrative purposes.

Which keyboard layouts are supported during the Bastion remote session?

Azure Bastion currently supports en-us-qwerty keyboard layout inside the VM. Support for other locales for keyboard layout is work in progress.

Is user-defined routing (UDR) supported on an Azure Bastion subnet?

No. UDR is not supported on an Azure Bastion subnet.

For scenarios that include both Azure Bastion and Azure Firewall/Network Virtual Appliance (NVA) in the same virtual network, you don’t need to force traffic from an Azure Bastion subnet to Azure Firewall because the communication between Azure Bastion and your VMs is private. For more information, see Accessing VMs behind Azure Firewall with Bastion.

Can I deploy multiple Azure resources in my Azure Bastion subnet?

No. The Azure Bastion subnet (AzureBastionSubnet) is reserved only for the deployment of your Azure Bastion resource.

Why do I get "Your session has expired" error message before the Bastion session starts?

A session should be initiated only from the Azure portal. Sign in to the Azure portal and begin your session again. If you go to the URL directly from another browser session or tab, this error is expected. It helps ensure that your session is more secure and that the session can be accessed only through the Azure portal.

How do I handle deployment failures?

Review any error messages and raise a support request in the Azure portal as needed. Deployment failures may result from Azure subscription limits, quotas, and constraints. Specifically, customers may encounter a limit on the number of public IP addresses allowed per subscription that causes the Azure Bastion deployment to fail.

How do I incorporate Azure Bastion in my Disaster Recovery plan?

Azure Bastion is deployed within VNets or peered VNets, and is associated to an Azure region. You are responsible for deploying Azure Bastion to a Disaster Recovery (DR) site VNet. In the event of an Azure region failure, perform a failover operation for your VMs to the DR region. Then, use the Azure Bastion host that's deployed in the DR region to connect to the VMs that are now deployed there.

Can I still deploy multiple Bastion hosts across peered virtual networks?

Yes. By default, a user sees the Bastion host that is deployed in the same virtual network in which VM resides. However, in the Connect menu, a user can see multiple Bastion hosts detected across peered networks. They can select the Bastion host that they prefer to use to connect to the VM deployed in the virtual network.

If my peered VNets are deployed in different subscriptions, will connectivity via Bastion work?

Yes, connectivity via Bastion will continue to work for peered VNets across different subscription for a single Tenant. Subscriptions across two different Tenants are not supported. To see Bastion in the Connect drop down menu, the user must select the subs they have access to in Subscription > global subscription.

Global subscriptions filter

I have access to the peered VNet, but I can't see the VM deployed there.

Make sure the user has read access to both the VM, and the peered VNet. Additionally, check under IAM that the user has read access to following resources:

  • Reader role on the virtual machine.
  • Reader role on the NIC with private IP of the virtual machine.
  • Reader role on the Azure Bastion resource.
  • Reader Role on the Virtual Network (Not needed if there is no peered virtual network).
Permissions Description Permission type
Microsoft.Network/bastionHosts/read Gets a Bastion Host Action
Microsoft.Network/virtualNetworks/BastionHosts/action Gets Bastion Host references in a Virtual Network. Action
Microsoft.Network/virtualNetworks/bastionHosts/default/action Gets Bastion Host references in a Virtual Network. Action
Microsoft.Network/networkInterfaces/read Gets a network interface definition. Action
Microsoft.Network/networkInterfaces/ipconfigurations/read Gets a network interface IP configuration definition. Action
Microsoft.Network/virtualNetworks/read Get the virtual network definition Action
Microsoft.Network/virtualNetworks/subnets/virtualMachines/read Gets references to all the virtual machines in a virtual network subnet Action
Microsoft.Network/virtualNetworks/virtualMachines/read Gets references to all the virtual machines in a virtual network Action