| Message Code | PIX-4-313004 |
| Severity | Warning |
| Description | Denied ICMP type=icmp_type, from source_address oninterface interface_name to dest_address:no matching session |
| Explanation | ICMP packets were dropped by the Cisco ASA because of security checks added by the stateful ICMP feature that are usually either ICMP echo replies without a valid echo request already passed across the Cisco ASA or ICMP error messages not related to any TCP, UDP, or ICMP session already established in the Cisco ASA . |
| User Action | None required. |
| Reference Links |
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