title: MongoError: no primary found in replicaset
body: <p>I have 2 application servers, which are connecting to a replicaSet (Primary, Secondary and Arbitrer).</p>
  
  <p>Issue i'm facing is </p>
  
  <pre><code> [ 'MongoError: no primary found in replicaset',
    '    at ../server/node_modules/mongodb-core/lib/topologies/replset.js:524:28',
    '    at null.&lt;anonymous&gt; (../server/node_modules/mongodb-core/lib/topologies/replset.js:303:24)',
    '    at g (events.js:260:16)',
    '    at emitOne (events.js:77:13)',
    '    at emit (events.js:169:7)',
    '    at null.&lt;anonymous&gt; (../server/node_modules/mongodb-core/lib/topologies/server.js:326:21)',
    '    at emitOne (events.js:77:13)',
    '    at emit (events.js:169:7)',
    '    at null.&lt;anonymous&gt; (../server/node_modules/mongodb-core/lib/connection/pool.js:270:12)',
    '    at g (events.js:260:16)',
    '    at emitTwo (events.js:87:13)',
    '    at emit (events.js:172:7)',
    '    at Socket.&lt;anonymous&gt; (../server/node_modules/mongodb-core/lib/connection/connection.js:175:49)',
    '    at Socket.g (events.js:260:16)',
    '    at emitOne (events.js:77:13)',
    '    at Socket.emit (events.js:169:7)',
    '    at connectErrorNT (net.js:996:8)',
    '    at nextTickCallbackWith2Args (node.js:442:9)',
    '    at process._tickCallback (node.js:356:17)' ]
  </code></pre>
  
  <p><em>ReplicaSet config on application :</em> </p>
  
  <pre><code> "mongodb" : { 
        "replicaset": {
         "db"       : "test",
         "user"     : "admin",
         "password" : "*********",
         "name":"rs1",  
         "replicas": [{"host":"App1Box.dmz.mytest.com.au","port":27017}, {"host":"App2Box.dmz.mytest.com.au","port":27018}]  
        } 
  </code></pre>
  
  <p><em>rs.status() output</em></p>
  
  <pre><code>rs1:PRIMARY&gt; rs.status()
  {
          "set" : "rs1",
          "date" : ISODate("2018-05-17T03:50:01Z"),
          "myState" : 1,
          "members" : [
                  {
                          "_id" : 2,
                          "name" : "App3Box:27018",
                          "health" : 1,
                          "state" : 7,
                          "stateStr" : "ARBITER",
                          "uptime" : 7180,
                          "lastHeartbeat" : ISODate("2018-05-17T03:50:00Z"),
                          "lastHeartbeatRecv" : ISODate("2018-05-17T03:50:00Z"),
                          "pingMs" : 0
                  },
                  {
                          "_id" : 3,
                          "name" : "App2Box:27018",
                          "health" : 1,
                          "state" : 1,
                          "stateStr" : "PRIMARY",
                          "uptime" : 7528,
                          "optime" : Timestamp(1526521846, 1),
                          "optimeDate" : ISODate("2018-05-17T01:50:46Z"),
                          "electionTime" : Timestamp(1526521798, 1),
                          "electionDate" : ISODate("2018-05-17T01:49:58Z"),
                          "self" : true
                  },
                  {
                          "_id" : 4,
                          "name" : "App1Box:27017",
                          "health" : 1,
                          "state" : 2,
                          "stateStr" : "SECONDARY",
                          "uptime" : 7139,
                          "optime" : Timestamp(1526521846, 1),
                          "optimeDate" : ISODate("2018-05-17T01:50:46Z"),
                          "lastHeartbeat" : ISODate("2018-05-17T03:50:01Z"),
                          "lastHeartbeatRecv" : ISODate("2018-05-17T03:50:01Z"),
                          "pingMs" : 0,
                          "syncingTo" : "App2Box:27018"
                  }
          ],
          "ok" : 1
  }
  </code></pre>
  
  <p>However, I'm seeing this only from one of the app server which is connecting to MongoDB say App1Box. I'm not seeing this issue on App2Box.</p>
  
  <p>I've tried removing members from replicaSets and re-added, issue still exists.</p>
  
  <blockquote>
    <p>Mongo version : 2.6.8 
    node version : 4.4.3
    npm version : 3.8.9</p>
  </blockquote>
  
  <p>I can see all the members in replicaSet from mongo console while performing rs.status() on primary and secondary.</p>
  
  <p>Thanks for your help.</p>