I have 2 FWSM running in active/standby mode. During a regular power maintenance, we shut down the standby FWSM and noticed that on our active FWSM the outside interface went to monitoring mode and stop receiving traffic.

This host: Primary - Active

Active time: 5667794 (sec)

Interface outside (*.*.*.*8): Waiting

Interface FDE (*.*.*.5): Normal (Not-Monitored)

Interface HR (*.*.*.*): Normal (Not-Monitored)

Interface BVoice (*.*.*.*): Normal (Not-Monitored)

Other host: Secondary - Failed

Active time: 0 (sec)