Hi,
Thanks for posting in Q&A platform.
May I know if your goal is block all IP to connection port 3389 except for the specific IP 192.168.2.50? If yes, create a new rule in Inbound Rules might not achieve your goal.
I have test in my lab environment and attaching the result for your reference:
I created a new rule in Inbound rules as the information you provided, I found the specific IP can RDP to the target machine, but the other IP can also RDP to the target machine.
If you just need the specific IP can RDP to the target machine via port 3389, I would suggest you could specify the specific remote IP in the following rules of Inbound rules in Windows Firewall:
Remote Desktop - user Mode (TCP-In)
Remote Desktop -User Mode (UDP-In)
Best Regards,
Sunny
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