When using 2 nodes in perf.Test and the attached config.txt plus sfc.xml, we get the following exception below.

Trace is:
at java.net.PlainDatagramSocketImpl.send(Native Method)
at java.net.DatagramSocket.send(DatagramSocket.java:612)
at org.jgroups.protocols.UDP._send(UDP.java:319)
at org.jgroups.protocols.UDP.sendToAllMembers(UDP.java:289)
at org.jgroups.protocols.TP.doSend(TP.java:1194)
at org.jgroups.protocols.TP.access$3300(TP.java:49)
at org.jgroups.protocols.TP$Bundler.sendBundledMessages(TP.java:1768)
at org.jgroups.protocols.TP$Bundler.send(TP.java:1689)
at org.jgroups.protocols.TP$Bundler.access$100(TP.java:1657)
at org.jgroups.protocols.TP.send(TP.java:1173)
at org.jgroups.protocols.TP.down(TP.java:957)
at org.jgroups.protocols.Discovery.down(Discovery.java:325)
at org.jgroups.protocols.MERGE2.down(MERGE2.java:184)
at org.jgroups.protocols.FD_SOCK.down(FD_SOCK.java:406)
at org.jgroups.protocols.FD.down(FD.java:363)
at org.jgroups.stack.Protocol.down(Protocol.java:270)
at org.jgroups.protocols.BARRIER.down(BARRIER.java:94)
at org.jgroups.protocols.pbcast.NAKACK.send(NAKACK.java:641)
at org.jgroups.protocols.pbcast.NAKACK.down(NAKACK.java:435)
at org.jgroups.protocols.UNICAST.down(UNICAST.java:398)
at org.jgroups.protocols.pbcast.STABLE.down(STABLE.java:312)
at org.jgroups.protocols.VIEW_SYNC.down(VIEW_SYNC.java:172)
at org.jgroups.protocols.pbcast.GMS.down(GMS.java:777)
at org.jgroups.protocols.SFC.down(SFC.java:257)
at org.jgroups.protocols.FRAG2.down(FRAG2.java:167)
at org.jgroups.protocols.pbcast.STATE_TRANSFER.down(STATE_TRANSFER.java:212)
at org.jgroups.stack.ProtocolStack.down(ProtocolStack.java:340)
at org.jgroups.JChannel.down(JChannel.java:1194)
at org.jgroups.JChannel.send(JChannel.java:575)
at org.jgroups.tests.perf.transports.JGroupsTransport.send(JGroupsTransport.java:85)
at org.jgroups.tests.perf.Test.sendMessages(Test.java:451)
at org.jgroups.tests.perf.Test.main(Test.java:808)