These failures is turning up when we run the JGroups 2.4.6.GA testsuite with scoped link-local addresses - MergeTest / DisconnectTest and MultiplexerMergeTest are failing with this exception:

[junit] 4603 [DEBUG] NAKACK.handleMessage(): - fe80:0:0:0:215:58ff:fec8:81a8%eth0:35158: received fe80:0:0:0:215:58ff:fec8:81a8%eth0:35158#0
[junit] 4603 [DEBUG] NAKACK.handleMessage(): - fe80:0:0:0:215:58ff:fec8:81a8%eth0:35158: received fe80:0:0:0:215:58ff:fec8:81a8%eth0:35158#0
[junit] 4607 [DEBUG] RouterStub.reconnect(): - failed reconnecting
[junit] java.net.SocketException: Invalid argument or cannot assign requested address
[junit] at java.net.PlainSocketImpl.socketConnect(Native Method)
[junit] at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
[junit] at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
[junit] at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
[junit] at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
[junit] at java.net.Socket.connect(Socket.java:519)
[junit] at java.net.Socket.connect(Socket.java:469)
[junit] at java.net.Socket.<init>(Socket.java:366)
[junit] at java.net.Socket.<init>(Socket.java:240)
[junit] at org.jgroups.stack.RouterStub.connect(RouterStub.java:143)
[junit] at org.jgroups.stack.RouterStub.reconnect(RouterStub.java:363)
[junit] at org.jgroups.stack.RouterStub.reconnect(RouterStub.java:379)
[junit] at org.jgroups.protocols.TUNNEL$Reconnector.run(TUNNEL.java:446)

I believe this may be a Sun JDK bug. Commenst to follow will explain.