title: Cassandra nodetool status showing "?N" on nodes
body: <p>After come time using cassandra on a 4 nodes cluster, it started to return "connection refused error" when i try to run cqlsh and my nodetool status is showing a "?N" state on the nodes except the node i'm in.</p>
  
  <p><a href="https://i.stack.imgur.com/A4i97.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/A4i97.jpg" alt="nodetool status"></a></p>
  
  <p>how can i fix it?</p>