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#### Allowing and Blocking ICMP Communications

ICMP communications are used for network troubleshooting purposes. By default, all ICMP communications are allowed. For the detailed description of ICMP messages, please refer to:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xpehelp/html/xeconconfiguringicmpsettingsinwindowsfirewall.asp

If you need to block or to allow ICMP communications, follow these steps:

1. Go to Server > IP Addresses > Firewall > ICMP Protocol.

   The predefined rules for ICMP communications are listed. The S (status) column shows the icon if the firewall blocks the packets that match the rule, and the icon if the firewall allows the packets that match the rule to pass through.

2. Do any of the following:
   - To allow ICMP requests of a specific type, click the respective icon in the S column.
   - To block ICMP requests of a specific type, click the respective icon in the S column.
   - To block all ICMP requests, click Panic Mode.
   - To restore the default settings for ICMP requests, click Default.