Here is something that I would like to share with every one and quite rare to find out. This tutorial will show how to block IPs on Windows server without firewall using IPSec:
Click 'Start' > 'Run' >type 'MMC' press ok.
In the console click > 'File' > 'Add/Remove Snap in'
In the 'Standalone Tab' click The 'add' button
Seclect 'IP Security Policy Managment' > 'ADD' > 'Local...
How Block IPs Using Windows IPSec
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