I'm running Server 2016 fully patched in a 5 node cluster. Hyper-V and S2D for a hyper-converged solution running a few hundred VMs. Two days ago one of my nodes decided that it wanted to be cranky. This caused the roles to rearrange on the systems and ended up putting one of my healthy nodes in the "Isolated" state. <g class="gr_ gr_456 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar only-ins replaceWithoutSep" data-gr-id="456" id="456">Root</g> cause for the other node that went out to lunch is still unknown and is being researched separately. However, this other healthy node has been stuck in an online but isolated state. See screenshot. I've seen plenty of examples where the node is offline and isolated, typically a network problem(network looks line. I have three separate NICs with separate switches/<g class="gr_ gr_3558 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling" data-gr-id="3558" id="3558">vlans</g>/IP space). I can live migrate VMs, my S2D storage is fully healthy on the cluster. No issues using this node, but I don't like the "isolated" state. I ran the cluster validation test for networking and it returns healthy. No warnings or errors in the validation test. Event logs show that the node when isolated, but in the same second I have a follow-up event that it's no longer isolated. These events exist on all nodes in the cluster, so there is no reason why it should be isolated. I'm sure if I rebooted this node(or even restarted the cluster service) that it would come back online as healthy, but another node in the cluster is having hardware issues, so that's not an option at the moment. Any thoughts would be appreciated on how to remove the isolated state. The end of the <g class="gr_ gr_5208 gr-alert gr_spell gr_inline_cards gr_run_anim ContextualSpelling ins-del multiReplace" data-gr-id="5208" id="5208">powershell</g> command shows it all. <g class="gr_ gr_5545 gr-alert gr_gramm gr_inline_cards gr_run_anim Grammar only-ins doubleReplace replaceWithoutSep" data-gr-id="5545" id="5545">State</g> is Up. StatusInformation is Isolated...
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