| Message Code | ASA-1-105021 |
| Severity | Alert |
| Description | (failover_unit) Standby unit failed to sync due to a locked context_name config.Lock held by lock_owner_name |
| Explanation | During configuration synchronizing, a standby unit will reload itself if some other process locks the configuration for more than 5 minutes, which prevents the failover process from applying the new configuration. This can occur when an administrator pages through a running configuration on the standby unit while configuration synchronization is in process. |
| User Action | Avoid viewing or modifying configuration on standby unit when it first comes up and is in the process of establishing a failover connection with the active unit. |
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