| Message Code | PIX-4-313003 |
| Severity | Warning |
| Description | Invalid destination for ICMP error |
| Explanation | The destination for the ICMP error message is different than the source of the IP packet that induced the ICMP error message. |
| User Action | If the message occurs frequently, this could be an active network probe, an attempt to use the ICMP error message as a covert channel, or a misbehaving IP host. Contact the administrator of the host that originated the ICMP error message. |
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