"Device Disconnected from the Controller" messages on backup ION after the upgrade to 6.3.2-b5

• GUI we see multiple alerts for the "Device Disconnected from the Controller" for the backup ION.

• The backup ION is not responding to ARP on the controller port IP address when the active device LAN interface is requesting it. 
• The MAC address of the backup ION controller interface cannot be resolved by the LAN interface on the primary ION. 

# inspect system arp interface=1 | grep 249
10.128.113.249                   (incomplete)                              eth5 

• ARP entry is not getting resolved on the LAN interface of the primary ION, we see the traffic from the backup ION controller interface towards the LAN interface of the primary ION but do not see SYN packets when we initiate tcpping from the controller interface of the backup ION.

# tcpping controller locator.cgnx.net:443
tcpping dial tcp: lookup locator.cgnx.net: i/o timeout

• Prisma SD-WAN
• ION Devices
• Version 6.3.2-b5

1. On the active device, add static ARP on the LAN interface for the controller interface of the backup device.
2. On the backup device, add static ARP on the LAN interface for the controller interface of the active device.

1. Upgrade to version 6.4.1 or 6.3.4.