Hi you have problem with your failover config on setup. you need to give standby ip address to those interface which you are monitoing. if you put the config site by site of the show failover you will see the ip addres are not seen on the other box which is why you having this issue. ! Version: Ours 9.5(2), Mate 9.5(2) Last Failover at: 13:37:34 UTC Mar 10 2019 This host: Primary - Standby Ready Active time: 16 (sec) slot 0: ASA5512 hw/sw rev (1.0/9.5(2)) status (Up Sys) Interface management (0.0.0.0): No Link (Not-Monitored) Interface XXX (10.111.4.9): Normal (Monitored) Interface YYY (0.0.0.0): Normal (Not-Monitored) slot 1: SFR5512 hw/sw rev (N/A/5.3.1-152) status (Up/Up) ASA FirePOWER, 5.3.1-152, Up, (Monitored) Other host: Secondary - Active Active time: 198 (sec) slot 0: ASA5512 hw/sw rev (1.0/9.5(2)) status (Up Sys) Interface management (192.168.1.1): Normal (Not-Monitored) Interface XXX (10.111.4.10): Normal (Monitored) Interface YYY (10.112.1.4): Normal (Not-Monitored) slot 1: SFR5512 hw/sw rev (N/A/5.3.1-152) status (Up/Up) ASA FirePOWER, 5.3.1-152, Up, (Monitored)
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