Port Unreachable on the SRX chassis cluster

Hi all,

There is a warning from our snmp monitoring tool. From its log:

The warning is Port Unreachable: SRX-Chassis-01 [ reth0.0 ] reth0.0 (X.Y.Z.W) ------> X.Y.Z.W is an IP address

{primary:node0}

SRX-Chassis-01> show interfaces terse | match reth0

ge-2/3/9.0              up    up   aenet    --> reth0.0

ge-5/3/9.0              up    up   aenet    --> reth0.0

reth0                      up    up

reth0.0                   up    up   inet     X.Y.Z.W/24

{primary:node0}

SRX-Chassis-01>

Can anyone have an idea about why this warning is being generating repeatly by the SNMP server as reth0.0 is up/up and where to start for troubleshooting?

Many Thanks