I have tried several fresh installs, setting everything accord to ALL the information listed in this thread and others that I have found, using any port other than 4569 for the X86 image does not work for incoming connections–even on LAN. The software simply will not listen at any other port number. I checked iptables and the it does not appear to be inhibiting anything.
The only workaround I have been able to find that works is port translation from the router. This requires two separate machines–one for each node. Both are listening on 4569, but the router sends incoming from 4569 to 4569 on once machine and 4568 to 4569 on the other.