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I have a security group with ICMP enabled and a machine (Windows Server 32bits) that uses it and I can successfully ping. Today I instantiated a new machine (Windows Server 64 bits) using the same security group. I'm not able to ping it neither from my machine nor from the 32bits instance. Nevertheless, I'm able to connect to it using Remote Desktop.

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migrated from stackoverflow.com Apr 1 '12 at 4:31

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1 Answer

up vote 1 down vote accepted

Have you checked Windows Firewall on the new instance? By default, it does not allow ICMP packets.

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