@arun_sh , thanks for confirming that 8.1.9 works for HA on your 5220 pair. I'm thinking of scheduling an update to 8.1.9 now that bug PAN-105737 has actually been fixed, along with the fixes for two of the three security advisories published yesterday. I'm not sure why the management port was not working for HA1 backup, the bug description only mentions AUX ports being in a link down state. I'd think that should be a question that PAN TAC would be able to answer. On our 5220 pair we are using AUX1 and AUX2 for HA1 and HA1 Backup as I like to keep management and HA functions separate if the hardware has the capability, but 5220's also have RJ45 dedicated HA1-A and HA1-B 1Gbps ports as well which you could look into using.
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