Magic Number Error when setting up externalized Sessions from EAP 7.2 to JDG 7.2

Issue

When trying to setup externalized HTTP sessions between EAP 7.2 and RHDG 7.2 we get this error:

09:37:00,614 INFO  [org.infinispan.server.endpoint] (MSC service thread 1-6) DGENDPT10002:  listening on 11.120.214.98:8080 (mapped to rest/rest)
09:37:42,126 ERROR [org.infinispan.server.hotrod.CacheDecodeContext] (HotRod-ServerWorker-5-1) ISPN005003: Exception reported: org.infinispan.server.hotrod.InvalidMagicIdException: Error reading magic byte or message id: 0
    at org.infinispan.server.hotrod.HotRodDecoder.readHeader(HotRodDecoder.java:184)
    at org.infinispan.server.hotrod.HotRodDecoder.decodeHeader(HotRodDecoder.java:133)
    at org.infinispan.server.hotrod.HotRodDecoder.decode(HotRodDecoder.java:92)
    at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:411)
    at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:248)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:341)
    at io.netty.channel.ChannelInboundHandlerAdapter.channelRead(ChannelInboundHandlerAdapter.java:86)
    at org.infinispan.server.core.transport.StatsChannelHandler.channelRead(StatsChannelHandler.java:26)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349)
    at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:341)
    at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1334)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363)
    at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:349)
    at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:926)
    at io.netty.channel.epoll.AbstractEpollStreamChannel$EpollStreamUnsafe.epollInReady(AbstractEpollStreamChannel.java:1018)
    at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:394)
    at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:299)
    at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:858)
    at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
    at java.lang.Thread.run(Thread.java:745)