Getting the below repeatedly on aem6.4.Please any sugesstions.
[Multicast Heartbeat Receiver Thread] net.sf.ehcache.distribution.MulticastKeepaliveHeartbeatReceiver Error receiving heartbeat. ICMP Port Unreachable. Initial cause was ICMP Port Unreachable
java.net.PortUnreachableException: ICMP Port Unreachable
at java.net.PlainDatagramSocketImpl.receive0(Native Method)
at net.sf.ehcache.distribution.MulticastKeepaliveHeartbeatReceiver$MulticastReceiverThread.run(MulticastKeepaliveHeartbeatReceiver.java:124) [org.apache.servicemix.bundles.ehcache:22.214.171.124]
If you have observed this error on a consistent basis then most likely its due to firewall issues otherwise if it happens intermittently then it could be due to heavy load on that server/network. Engage network team, find out the server load/statistics, check GC logs, traffic volume, lb logs etc.
If you are using distributed/replicated caching then it could be related to clustered network or server overload within that cluster.Find out recent changes in the setup since you observed the error.