My system is server 2016 standard. How can I set the server to only accept remote desktop requests sent from the IP address of the springboard machine, and reject all requests from the IP address of other hosts.
For an Azure VM, you can create a network security group and associate it with the NIC of your virtual machine. With an NSG, you can create a deny rule for TCP port 3389 (RDP) and then create an allow rule and only allow the source IP address of your springboard VM. This will block any other VMs on the virtual network from accessing via RDP.
Here's some guides to help you with this:
https://docs.microsoft.com/en-us/azure/virtual-network/network-security-groups-overview
https://docs.microsoft.com/en-us/azure/virtual-network/tutorial-filter-network-traffic
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