On some machine, the network IPv4/IPv6 dual-stack is available, even if the network is configure to be an IPv4 network. As the JVM uses by default IPv6, if it is available, and for performances reasons when the dual-stack is available, the Petals ESB startup script forces the usage of the IPv4 stack.

If your network is a full IPv6 network, you must update the Petals ESB startup script removing the option "-Djava.net.preferIPv4Stack=true" or replacing it by "-Djava.net.preferIPv6Stack=true".

More information on network properties of the JVM can be found here: http://download.oracle.com/javase/6/docs/technotes/guides/net/properties.html