![]() ![]() The virtual machine does not require a public IP address or a “NAT rule”, but it’s still SSH/RDP. AZURE BASTION WINDOWSYou sign into the portal, click Connect and use the Bastion service to connect to a Linux or Windows virtual machine via SSH/RDP in the Portal. In this case, Bastion is a service that is accessible via the Azure Portal. In case you don’t know this, a bastion host is another name for a jumpbox – an isolated machine that you bounce through. AZURE BASTION CODEThe solution requires you to either disable NLA in the guest OS (boo!) or to hard code a username/password with local logon rights for your guest OS’s into the Guacamole server (double-boo!). It’s a HTTPS-based service that allows you to proxy into Linux or Windows virtual machines via RDP or SSH.Īll looked good until you started running Windows Server 2016 or later in your virtual machines and you needed NLA for secure connections via RDP. Also, you are limited to 2 RDS connections per jumpbox without investing in a larger RDS (machines + licensing) solution. You could combine JIT VM Access, but now normal daily operations are going to be a drag and I guarantee you that people will invest time to undermine network security. So in the remoting protocol vulnerability scenario, you are still vulnerable at the application layer. Unfortunately, it’s still straight RDP/SSH into a machine that is directly accessible on the Internet. You remote into a jumpbox, and from there, you remote into one of your application/data virtual machines. They are isolated into a dedicated subnet. This is an old method – a single virtual machine, or maybe a few of them, are made available for direct access. ![]() And the way JIT VM Access manages the rules now is wonky, so I would not trust it. So, if it’s all set up right, you deny remote access to virtual machines most of the time. When you need to remote onto a VM, an NSG rule is added for a managed amount of time to allow remote access via the selected protocol from a specific source IP address. It modifies your NSG rules to deny managed protocols such as RDP/SSH (the deny rules are stupidly made as low priority so they don’t override any allow rules!). JIT VM Access is a feature of Security Center Standard Tier. AZURE BASTION PASSWORDIf you have supported end user VPN then you know that it’s right up there with password resets for helpdesk ticket numbers, even with IT people like developers. The clue is in the maximum number of simultaneous connections which is 128, way too low to consider as an end user solution for a Fortune 1000, who Microsoft really do their planning for. The real reason that we have point-to-site VPN in Azure virtual network gateway was as an admin entry point to the virtual network. There are ways that you can secure things, but they all have the pluses and minuses. And if the recent scare about the RDP vulnerability didn’t wake you up to this, then maybe you deserve to have someone else’s bot farm or a bitcoin mine running in your network. If you enable Standard Tier Security Center, the alerts will let you know how bad pretty quickly. Just opening up RDP or SSH straight through a public IP address is bad – hopefully you have an NSG in place, but even that’s bad. Remember: for 99.9% of customers, servers are not cattle, they are sacred cows. You need RDP or SSH to be able to run these machines in the real world. ![]() Most people that are using The Cloud are using virtual machines, and one of the great challenges for them is secure remote access. Microsoft has announced a new preview of a platform-based jumpbox called Azure Bastion for providing secure RDP or SSH connections to virtual machines running or hosted in Azure. ![]()
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