I am having problems starting JBOSS 4.0.4 from MyEclipse Enterprise Workbench 5.5.1 on Fedora core 7.

Following is a part of the message:
INFO [Server] JBoss (MX MicroKernel) [4.0.4.GA (build: CVSTag=JBoss_4_0_4_GA date=200605151000)] Started in 26s:314ms
ERROR [UDP] exception=java.io.IOException: Network is unreachable, msg=[dst: 228.1.2.3:45566, src: localhost:32776 (additional data: 14 bytes) (2 headers), size = 0 bytes], mcast_addr=228.1.2.3:45566
ERROR [UDP] exception=java.io.IOException: Network is unreachable, msg=[dst: 228.1.2.3:45566, src: localhost:32776 (additional data: 14 bytes) (3 headers), size = 0 bytes], mcast_addr=228.1.2.3:45566
ERROR [UDP] exception sending msg (to dest=230.1.2.7:45577): java.io.IOException: Network is unreachable

Please help.