org.jgroups.protocols.UDP failed sending message to null (191 bytes) java.lang.Exception: dest=/224.1.2.22:45222 (194 bytes) ----------------------------------------------------------------------------------------------------------------------------- Key: JBCACHE-1639 URL: https://issues.jboss.org/browse/JBCACHE-1639 Project: JBoss Cache Issue Type: Bug Reporter: Bagavathi S Assignee: Manik Surtani In our application we are using the below components of Jboss 1. JGroups Version: 2.6.13.GA 2. Jboss Cache Version: 3.2.2.GA We observed the ERROR as “failed sending message to null (191 bytes) java.lang.Exception: dest=/224.1.2.22:45222 (194 bytes)” [full stack Trace below] ERROR] - 07/02/16 07:12:57 - org.jgroups.protocols.UDP --> failed sending message to null (191 bytes) java.lang.Exception: dest=/224.1.2.22:45222 (194 bytes) at org.jgroups.protocols.UDP._send(UDP.java:361) at org.jgroups.protocols.UDP.sendToAllMembers(UDP.java:302) at org.jgroups.protocols.TP.doSend(TP.java:1474) at org.jgroups.protocols.TP.send(TP.java:1464) at org.jgroups.protocols.TP.down(TP.java:1185) at org.jgroups.protocols.Discovery.down(Discovery.java:374) at org.jgroups.protocols.MERGE2.down(MERGE2.java:175) at org.jgroups.protocols.FD_SOCK.down(FD_SOCK.java:360) at org.jgroups.protocols.FD.down(FD.java:315) at org.jgroups.protocols.VERIFY_SUSPECT.down(VERIFY_SUSPECT.java:95) at org.jgroups.protocols.pbcast.NAKACK.send(NAKACK.java:803) at org.jgroups.protocols.pbcast.NAKACK.down(NAKACK.java:604) at org.jgroups.protocols.UNICAST.down(UNICAST.java:455) at org.jgroups.protocols.pbcast.STABLE$StabilitySendTask.run(STABLE.java:855) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.io.IOException: Operation not permitted at java.net.PlainDatagramSocketImpl.send(Native Method) at java.net.DatagramSocket.send(DatagramSocket.java:676) at org.jgroups.protocols.UDP._send(UDP.java:352) ... 20 more We would like to know the cause the Error and does it impact the replication of Jboss Cache across the nodes in the cluster.