title: Cannot add values to Redis cluster - The cluster is down
body: <p>I have 4 nodes, 3 are master and 1 of them is a slave. I am trying to add a simple string by <code>set foo bar</code>, but whenever i do it, i get this error:</p>
  
  <pre><code>(error) CLUSTERDOWN The cluster is down
  </code></pre>
  
  <p><strong>Below is my cluster info</strong></p>
  
  <pre><code>127.0.0.1:7000cluster info
  
  cluster_state:fail
  
  cluster_slots_assigned:11
  
  cluster_slots_ok:11
  
  cluster_slots_pfail:0
  
  cluster_slots_fail:0
  
  cluster_known_nodes:4
  
  cluster_size:3
  
  cluster_current_epoch:3
  
  cluster_my_epoch:3
  
  cluster_stats_messages_sent:9262
  
  cluster_stats_messages_received:9160
  </code></pre>
  
  <p>I am using <strong>Redis-x64-3.0.503</strong>. please let me know how to solve this</p>
  
  <p><strong>Cluster Nodes:</strong></p>
  
  <pre><code>87982f22cf8fb12c1247a74a2c26cdd1b84a3b88 192.168.2.32:7000 slave bc1c56ef4598fb4ef9d26c804c5fabd462415f71 1492000375488 1492000374508 3 connected
  
  9527ba919a8dcfaeb33d25ef805e0f679276dc8d 192.168.2.35:7000 master - 1492000375488 1492000374508 2 connected 16380
  
  ff999fd6cbe0e843d1a49f7bbac1cb759c3a2d47 192.168.2.33:7000 master - 1492000375488 1492000374508 0 connected 16381
  
  bc1c56ef4598fb4ef9d26c804c5fabd462415f71 127.0.0.1:7000 myself,master - 0 0 3 connected 1-8 16383
  </code></pre>