Try telnet on your listen port. It must be network issue due to port or 
firewall issue.

Sent from my iPhone

> On Dec 22, 2017, at 5:28 PM, sat <sathish.al...@gmail.com> wrote:
> 
> 
> 
> Hi,
> 
> We have 3 nodes in cluster, we rebooted one of the cassandra VM, we noticed 
> nodetool status returning "UN" for itself and "DN" for other node, although 
> we observe gossip sync and ack messages being shared between these nodes. 
> 
> Issue in Detail
> 
> Nodes in cluster
> Node1
> Node 2
> Node 3
> 
> All above nodes formed cluster and nodetool status in all 3 machines were "UN"
> 
> We rebooted Node 1 and restarted cassandra on node1, then we ran nodetool 
> status and observed
> 
> Node 1 - UN
> Node 2 - DN
> Node 3 - DN
> 
> However when we run nodetool status on other 2 nodes (Node2, and Node 3) they 
> claim all 3 nodes are "UN"
> 
> We enabled "Trace" level and checked Gossip messages and noticed "SYN", "ACK" 
> and "ACK2" initiated and received messages in Node 1 for other 2 nodes, but 
> still nodetool status marks other 2 nodes as down.
> 
> Please let us know how nodetool detects other nodes as "DOWN". Any help is 
> highly appreciated.
> 
> Thanks
> A.SathishKumar

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