Entropy is used to calculate random data that is used by the system in cryptographic operations. Some environments with low entropy may have intermittent performance issues with SSL-based communication. This is more typical on virtual machines, but can occur in physical instances as well. Monitor the kernel.random.entropy_avail in sysctl value for best results.

If necessary, update $JAVA_HOME/jre/lib/security/java.security to use file:/dev/./urandom for the securerandom.source property.