JGroups TCPPING configuration for two nodes, 'ip.address.node.1', and 'ip.address.node.2'. Obviously, replace those strings with the IP addresses of the two AWS nodes.

gistfile1.xml

        <subsystem xmlns="urn:jboss:domain:jgroups:1.1" default-stack="tcp">
            <stack name="tcp">
              <transport type="TCP" socket-binding="jgroups-tcp"/> 
                <protocol type="TCPPING">
                <property name="timeout">30000</property>
                <property name="initial_hosts">ip.address.node.1[7600],ip.address.node.2[7600]</property>
              </protocol>

              <protocol type="MERGE2"/>
              <protocol type="FD_SOCK" socket-binding="jgroups-tcp-fd"/>
              <protocol type="FD"/>
              <protocol type="VERIFY_SUSPECT"/>
              <protocol type="BARRIER"/>
              <protocol type="pbcast.NAKACK2"/>
              <protocol type="UNICAST2"/>
              <protocol type="pbcast.STABLE"/>
              <protocol type="pbcast.GMS"/>
              <protocol type="UFC"/>
              <protocol type="MFC"/>
              <protocol type="FRAG2"/>
              <protocol type="RSVP"/>
            </stack>
        </subsystem>