Resolution: Clients have queried fact when running "ifconfig -a" igb0 (Management-1 interface) and has no IP address assigned.
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igb0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 3
inet 0.0.0.0 netmask ffffff00 broadcast 0.0.0.255
ether 64:e:94:28:3:83
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This is expected when the EMS Server Gateway IP is defined. Generally, for EMSA, if there is an EMS-Gateway defined and port 41 or 42 has link-light on boot, then normally the EMS-gateway is assigned as the only default route and the mgmt-IP and mgmt-Gw are moved to the zone so that CLI access via the mgmt-IP is preserved. This is set up by default when the appliance is set up and the uplink connected. The Mgmt Gateway IP setting can be checked by running the CLI interface command "setup-show". If this setup cannot be followed and the mgmt-zone cannot be installed then the mgmt-IP should be setup on igb0 and the EMS-Gateway will be used instead. This mostly effects older versions.