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I have a pair of Windows XP computers that are connected by Ethernet cables to the same hub and they are in the same subnet (10.1.10.0/24), but they cannot ping each other. When I do attempt the ping, the requests time out but the arp cache gets an entry with the correct IP/MAC address pair. What could cause this to happen?

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Is the Windows firewall or a third party firewall turned on? That would block ICMP.

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  • This was the problem. The firewalls on both computers (McAfee in this case), were set up to block incoming ping requests.
    – yalehookeye
    Commented Mar 9, 2012 at 20:00

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