Technical Tip: Explaining HA sync error 'send() failed: 14(Bad address)'

During HA random disconnects, below error is observed:

<hasync:WARN> conn=0x10e812b0 send() failed: 14(Bad address). conn->dst=169.254.0.2

Verify the following settings:

• The destination unit is receiving the HA traffic.
• If there is a switch/Router in between, make sure Multicast traffic is allowed.
• Verify that all remote devices in HA have valid HA interface IPs.
• If HA devices are geographically located in distant locations, make sure all devices between them allow multicast traffic.
• Unicast can be used as well if Multicast traffic is getting blocked or dropped between devices:

config system ha
    set hbdev port1 50
    set unicast-hb enable
    set unicast-hb-peerip 10.10.10.1
end

HA SYNC debug logs can be collected with the following commands:

diagnose debug enable

diagnose debug console timestamp enable

diagnose debug application hasync -1   

diagnose debug enable

diagnose debug disable <----- To stop the debug output.

Related document:

Unicast HA Heartbeat