[SOLVED] Unable to join 3rd node to cluster

OH MY GOD. I bloody finally resolved this, after trying seemingly everything under the sun. It ended up being this thread that pointed me in the right direction. I was configuring one of the nodes at the end of a powerline connector that allowed me to get a network line to another room. For whatever reason it must have been causing issues with multicast cos after I put both machines on the same switch I was successful in creating the cluster correctly. Man I was tearing my hair out for a while there.
Thanks for the help.
 
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@gurgle Thank you very much! I had the same issue, struggling for three days with adding a third node, and it was solved by connecting all nodes to the same switch.