Release notes - Payara Platform Enterprise 6.4.0

The Hazelcast 5.3.1 upgrade adds socket options for per-socket keep-alive configuration. When running Payara on Windows, this version of Hazelcast throws a warning in the server logs, similar to this: "Ignoring TCP_KEEPCOUNT. It seems your JDK does not support jdk.net.ExtendedSocketOptions on this OS. Try upgrading to the latest JDK or check with your JDK vendor.Alternatively, on Linux, configure tcp_keepalive_probes in the kernel (affecting default keep-alive configuration for all sockets): For more info see [keep alive]. If this isn’t dealt with, idle connections could be closed prematurely." This is a Hazelcast known issue that is documented [here].