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IBM WebSphere - Resolve "Received an illegal configuration argument"

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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: . Exception is java.lang.Exception: Network Interface 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="" port="12345"/>


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

~]$ nslookup
Address:      canonical name =


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 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 brd 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


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June 14 2022 by Kuopeihsin
Very useful, thank you

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