Please find the logs...
Secondary Firewall While Sync..
cisco-asa(config)# sh failover
Failover On
Failover unit Secondary
Failover LAN Interface: e0/7 Vlan3 (up)
Unit Poll frequency 1 seconds, holdtime 15 seconds
Interface Poll frequency 5 seconds, holdtime 25 seconds
Interface Policy 1
Monitored Interfaces 4 of 23 maximum
Version: Ours 8.2(5), Mate 8.2(5)
Last Failover at: 06:01:10 GMT Apr 29 2015
This host: Secondary - Sync Config
Active time: 55 (sec)
slot 0: ASA5505 hw/sw rev (1.0/8.2(5)) status (Up Sys)
Interface outside (27.251.167.246): No Link (Waiting)
Interface inside (10.11.0.20): No Link (Waiting)
Interface mgmt (10.11.200.21): No Link (Waiting)
slot 1: empty
Other host: Primary - Active
Active time: 177303 (sec)
slot 0: ASA5505 hw/sw rev (1.0/8.2(5)) status (Up Sys)
Interface outside (27.251.167.247): Unknown (Waiting)
Interface inside (10.11.0.21): Unknown (Waiting)
Interface mgmt (10.11.200.22): Unknown (Waiting)
slot 1: empty
=======================================================================================
Secondary Firewall Just after Sync ,Active (primary Firewall got rebootted)
cisco-asa# sh failover
Failover On
Failover unit Secondary
Failover LAN Interface: e0/7 Vlan3 (up)
Unit Poll frequency 1 seconds, holdtime 15 seconds
Interface Poll frequency 5 seconds, holdtime 25 seconds
Interface Policy 1
Monitored Interfaces 4 of 23 maximum
Version: Ours 8.2(5), Mate Unknown
Last Failover at: 06:06:12 GMT Apr 29 2015
This host: Secondary - Active
Active time: 44 (sec)
slot 0: ASA5505 hw/sw rev (1.0/8.2(5)) status (Up Sys)
Interface outside (27.251.167.246): Normal (Waiting)
Interface inside (10.11.0.20): No Link (Waiting)
Interface mgmt (10.11.200.21): No Link (Waiting)
slot 1: empty
Other host: Primary - Not Detected
Active time: 0 (sec)
slot 0: empty
Interface outside (27.251.167.247): Unknown (Waiting)
Interface inside (10.11.0.21): Unknown (Waiting)
Interface mgmt (10.11.200.22): Unknown (Waiting)
slot 1: empty
==========================================================================================
After Active firewall got rebootted failover off,whole network gone down.
cisco-asa# sh failover
Failover Off
Failover unit Secondary
Failover LAN Interface: e0/7 Vlan3 (up)
Unit Poll frequency 1 seconds, holdtime 15 seconds
Interface Poll frequency 5 seconds, holdtime 25 seconds
Interface Policy 1
Monitored Interfaces 4 of 23 maximum
===========================================================================================
Primary Firewall after rebootting
cisco-asa# sh failover
Failover On
Failover unit Primary
Failover LAN Interface: e0/7 Vlan3 (Failed - No Switchover)
Unit Poll frequency 1 seconds, holdtime 15 seconds
Interface Poll frequency 5 seconds, holdtime 25 seconds
Interface Policy 1
Monitored Interfaces 4 of 23 maximum
Version: Ours 8.2(5), Mate Unknown
Last Failover at: 06:17:29 GMT Apr 29 2015
This host: Primary - Active
Active time: 24707 (sec)
slot 0: ASA5505 hw/sw rev (1.0/8.2(5)) status (Up Sys)
Interface outside (27.251.167.246): Normal (Waiting)
Interface inside (10.11.0.20): Normal (Waiting)
Interface mgmt (10.11.200.21): Normal (Waiting)
slot 1: empty
Other host: Secondary - Failed
Active time: 0 (sec)
slot 0: empty
Interface outside (27.251.167.247): Unknown (Waiting)
Interface inside (10.11.0.21): Unknown (Waiting)
Interface mgmt (10.11.200.22): Unknown (Waiting)
slot 1: empty
cisco-asa# sh failover history
==========================================================================
From State To State Reason
==========================================================================
06:16:43 GMT Apr 29 2015
Not Detected Negotiation No Error
06:17:29 GMT Apr 29 2015
Negotiation Just Active No Active unit found
06:17:29 GMT Apr 29 2015
Just Active Active Drain No Active unit found
06:17:29 GMT Apr 29 2015
Active Drain Active Applying Config No Active unit found
06:17:29 GMT Apr 29 2015
Active Applying Config Active Config Applied No Active unit found
06:17:29 GMT Apr 29 2015
Active Config Applied Active No Active unit found
==========================================================================
cisco-asa#
cisco-asa# sh failover state
State Last Failure Reason Date/Time
This host - Primary
Active None
Other host - Secondary
Failed Comm Failure 06:17:43 GMT Apr 29 2015
====Configuration State===
====Communication State===
==================================================================================
Secondary Firewall
cisc-asa# sh failover h
==========================================================================
From State To State Reason
==========================================================================
06:16:32 GMT Apr 29 2015
Not Detected Negotiation No Error
06:17:05 GMT Apr 29 2015
Negotiation Disabled Set by the config command
==========================================================================
cisco-asa# sh failover
Failover Off
Failover unit Secondary
Failover LAN Interface: e0/7 Vlan3 (down)
Unit Poll frequency 1 seconds, holdtime 15 seconds
Interface Poll frequency 5 seconds, holdtime 25 seconds
Interface Policy 1
Monitored Interfaces 4 of 23 maximum
ecs-pune-fw-01# sh failover h
==========================================================================
From State To State Reason
==========================================================================
06:16:32 GMT Apr 29 2015
Not Detected Negotiation No Error
06:17:05 GMT Apr 29 2015
Negotiation Disabled Set by the config command
==========================================================================
cisco-asa# sh failover state
State Last Failure Reason Date/Time
This host - Secondary
Disabled None
Other host - Primary
Not Detected None
====Configuration State===
====Communication State===
Thanks...