In preview – Configure just-in-time virtual machine access from the VM blade
Just-in-time virtual machine access can now be configured from the virtual machine blade (in preview) to make it even easier for you to reduce your exposure to threats.
Attackers commonly target open ports on internet-facing virtual machines, spanning from port scanning to brute force and DDoS attacks. One way to reduce exposure to an attack is to limit the amount of time that a port on your virtual machine is open. Ports only need to be open for a limited amount of time for you to perform management or maintenance tasks. Just-in-time virtual machine access helps you control the time that the ports on your virtual machines are open.
Source: Azure Roadmap