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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 (, 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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up vote 4 down vote accepted

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 Mar 9 '12 at 20:00

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