ICMP is, however, blocked by default by Windows Fire- wall in Windows Vista and Windows Server 2008, and it is also blocked by some routers and stand-alone firewalls. Consequently, to perform adequate troubleshooting of network con- nectivity, you need to ensure that ICMP is not blocked by the remote host. To enable a fire- wall exception for ICMP in Windows Vista and Windows Server 2008, enable File Sharing in Network and Sharing Center.
If you want to be able to ping a computer, you don't have to turn off the firewall. You only need to TURN ON the file sharing in network sharing center.
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