Getting "JGRP000006: failed accepting connection from peer" in JBoss EAP 7 and RHDG 7/8

Issue

Getting the following "JGRP000006: failed accepting connection from peer: ..." logging in server.log of EAP 6.x and JDG 6.x. What causes this?

WARN  [org.jgroups.protocols.TCP] (ConnectionMap.Acceptor [127.0.0.1:7600]) JGRP000006: failed accepting connection from peer: java.net.SocketTimeoutException: Read timed out
    at java.net.SocketInputStream.socketRead0(Native Method) [rt.jar:1.7.0_79]
    at java.net.SocketInputStream.read(SocketInputStream.java:152) [rt.jar:1.7.0_79]
    at java.net.SocketInputStream.read(SocketInputStream.java:122) [rt.jar:1.7.0_79]
    at java.io.BufferedInputStream.fill(BufferedInputStream.java:235) [rt.jar:1.7.0_79]
    at java.io.BufferedInputStream.read1(BufferedInputStream.java:275) [rt.jar:1.7.0_79]
    at java.io.BufferedInputStream.read(BufferedInputStream.java:334) [rt.jar:1.7.0_79]
    at java.io.DataInputStream.readFully(DataInputStream.java:195) [rt.jar:1.7.0_79]
    at org.jgroups.blocks.TCPConnectionMap$TCPConnection.readPeerAddress(TCPConnectionMap.java:510) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$TCPConnection.<init>(TCPConnectionMap.java:380) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$Acceptor.handleAccept(TCPConnectionMap.java:302) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$Acceptor.run(TCPConnectionMap.java:286) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_79]

WARN  [org.jgroups.protocols.TCP] (ConnectionMap.Acceptor [127.0.0.1:7600]) JGRP000006: failed accepting connection from peer: java.io.EOFException
    at java.io.DataInputStream.readFully(DataInputStream.java:197) [rt.jar:1.7.0_79]
    at org.jgroups.blocks.TCPConnectionMap$TCPConnection.readPeerAddress(TCPConnectionMap.java:510) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$TCPConnection.<init>(TCPConnectionMap.java:380) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$Acceptor.handleAccept(TCPConnectionMap.java:302) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$Acceptor.run(TCPConnectionMap.java:286) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_79]

WARN  [org.jgroups.protocols.TCP] (ConnectionMap.Acceptor [127.0.0.1:7600]) JGRP000006: failed accepting connection from peer: java.net.SocketException: ConnectionMap.Connection.readPeerAddress(): cookie read by 127.0.0.1:7600 does not match own cookie; terminating connection
    at org.jgroups.blocks.TCPConnectionMap$TCPConnection.readPeerAddress(TCPConnectionMap.java:512) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$TCPConnection.<init>(TCPConnectionMap.java:380) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$Acceptor.handleAccept(TCPConnectionMap.java:302) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at org.jgroups.blocks.TCPConnectionMap$Acceptor.run(TCPConnectionMap.java:286) [jgroups-3.6.2.Final-redhat-2.jar:3.6.2.Final-redhat-2]
    at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_79]