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I have:

  • An Azure virtual network
  • A Point-To-Site (P2S) Virtual Network Gateway
  • A subnet inside that network
  • A virtual machine inside the subnet
  • A network security group that the VM is a member of, with default rules set

The only way I've been able to RDP into the machine is using the public IP address and setting the following network security group rule:

  • Priority: 1000
  • Name: default-allow-rdp
  • Port: 3389
  • Protocol: TCP
  • Source: Any
  • Destination: Any
  • Action: Allow

My goal is to allow users to RDP to the VM only when connected to the VPN. How can I achieve this? Bonus: can it be achieved with the private (vs public) IP address? I have played with different sources (service tags, VPN IP address space), destinations (specific IP address ranges), with no success.

Obviously I don't want port 3389 exposed for the world to exploit.

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Yes, you can achieve this with just private ip address of the vm. you dont need to do anything (unless you specifically block traffic inside vnet with nsg). you can remove the public ip address and it will just work

if you do block traffic inside vnet you need to add allow rule to port 3389 (or whatever your rdp port is) from the p2s vpn range

  • Got it: so the NSG rule should look like:Priority: 1000 Name: default-allow-rdp Port: 3389 Protocol: TCP Source: IP Addresses (VPN IP address pool) Destination: Subnet address pool Action: Allow – todon2 Aug 14 '18 at 21:22
  • yeah, and it only needed if you are blocking this communication by other rule, because by default its working. if this answer helped you - you should accept it ;) – 4c74356b41 Aug 15 '18 at 5:34

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