Mule ESB Runtime - Network is unreachable

In certain situations, Mule ESB is not able to connect to a server. The problem can be caused by the IPv6 protocol.

java.net.SocketException: Network is unreachable: connect
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
    at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
    at java.net.Socket.connect(Socket.java:518)
    at java.net.Socket.connect(Socket.java:468)

The failure can be caused by the preference of IPv6. The JVM parameter force to use IPv4.

-Djava.net.preferIPv4Stack=true
Author: dataliquid GmbH
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