Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Troubleshooting Guide

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### Description

The HADB management system is dependent on UDP Multicast messages on multicast address `228.8.8.8`. If these messages cannot get through, the `createdomain` command fails with the following message:

    The management agents could not establish a domain, please check that the
    hosts can communicate with UDP multicast.

Possible causes include:

- The agents are running on hosts with several network interfaces on different subnets.

- There is a switch on the network that does not forward multicast messages.

- There is router on the network that does not route multicast messages with the address `228.8.8.8`.

- Multicast messages are disabled in the operating system (for example, on Solaris 10).

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