UnicastUdpSocket failed to set receive buffer size to 1444 packets

Error:-

<Mar 15, 2018 1:16:29 PM IST> <Warning> <Coherence> <BEA-000000> <2018-03-15 13:16:29.502/406.395 Oracle Coherence GE 3.7.1.13 <Warning> (thread=[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)', member=n/a): PreferredUnicastUdpSocket failed to set receive buffer size to 1444 packets (1.99MB); actual size is 25%, 361 packets (511KB). Consult your OS documentation regarding increasing the maximum socket buffer size. Proceeding with the actual value may cause sub-optimal performance.>

<Mar 15, 2018 1:16:59 PM IST> <Warning> <Coherence> <BEA-000000> <2018-03-15 13:16:59.697/436.590 Oracle Coherence GE 3.7.1.13 <Warning> (thread=Cluster, member=n/a): This Member(Id=0, Timestamp=2018-03-15 13:16:29.524, Address=10.148.192.126:8088, MachineId=8272, Location=site:,machine:droim04,process:18049, Role=WeblogicServer) has been attempting to join the cluster at address /227.7.7.12:9778 with TTL 4 for 30 seconds without success; this could indicate a mis-configured TTL value, or it may simply be the result of a busy cluster or active failover.>

<Mar 15, 2018 1:16:59 PM IST> <Warning> <Coherence> <BEA-000000> <2018-03-15 13:16:59.698/436.591 Oracle Coherence GE 3.7.1.13 <Warning> (thread=Cluster, member=n/a): Received a discovery message that indicates an older member announcing:

Resolution:-

Though it is safe to operate with the smaller buffers it is recommended that you configure your OS to allow for larger buffers.

On Linux execute (as root):-

Go to /etc/sysctl/conf fine and change below value

sysctl -w net.core.rmem_max=2096304

sysctl -w net.core.wmem_max=2096304





Regards,
Aditya.