I am using my laptop on a Home Network. It is behind NAT router. I am using a tool called a Shield UP which tells me the existing ports on the system. It runs a small test to check ports health. I had allowed all the network access that I need for applications and games. I found ICMP button as ticked under Firewall advance tab and it does not allow me to disable it. I cannot at all remove the tick. There is one more computer on the same network which has a single modem connected. On that system I was able to remove tick for ICMP settings. What could be the reason.
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