Let's say something like this is being returned when attempting to start a WebSphere network deployment manager or node.

DCSV9403E: Received an illegal configuration argument. Parameter MulticastInterface, value: 10.2.1.10 . Exception is java.lang.Exception: Network Interface 10.2.1.10 was not found in local machine network interface list. Make sure that the NetworkInterface property is properly configured!

This can be caused if the serverindex.xml file (e.g. /opt/WebSphere/AppServer/profiles/your_profile/config/cells/your_cell/nodes/your_node/serverindex.xml) has one or more invalid hostnames.

<endPoint xmi:id="EndPoint_1" host="dmgr.example.com" port="12345"/>

Notice in this example that nslookup resolves dmgr.example.com to the IP address listed in the error message. This means that the issue has something to do with dmgr.example.com and IP address 10.2.1.10 .

~]$ nslookup dmgr.example.com
Server:         10.2.10.5
Address:        10.2.10.5#53

dmgr.example.com      canonical name = dmgr.example.com.
Name:   dmgr.example.com
Address: 10.2.1.10 

The ip command (on a Linux server) can be used to determine if their is a network interface containing the IP address in question. Notice in this example that there isn't an interface that contains the IP address being returned in the error message.

~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eno16777984: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:64:f5:94 brd ff:ff:ff:ff:ff:ff
    inet 10.2.7.14/24 brd 192.168.0.255 scope global noprefixroute eno16777984
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe64:f594/64 scope link
       valid_lft forever preferred_lft forever