| Message Code | ASA-5-720021 |
| Severity | Notification |
| Description | (VPN-unit) HA non-block send failed for peer msg message_number. HA error code. |
| Explanation | The VPN failover subsystem fails to send a non-block message. unit—Either “Primary” or “Secondary” message_number—ID number of the peer message. code—Error return code. |
| User Action | This is a temporary condition causes by system under load or out of system resources. The system condition will improve as more system resources are freed up. |
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