08.216.2005 - ICMP packets are dropped even though you have configured the Windows firewall feature to allow ICMP packets on your Windows XP Professional SP2-based computer (KB889527)

If you configure your computer that is running Microsoft Windows XP Professional Service Pack 2 (SP2) as the endpoint of a Tunnel mode Internet Protocol security (IPSec) connection, packets are dropped. This symptom occurs if you turn on the Windows Firewall feature. Additionally, packets are dropped even though you have configured the Windows firewall feature to allow ICMP packets. - Download Microsoft Windows XP SP2 Update - View Microsoft Knowledge Base Article - 889527 - Visit Microsoft Corporation