trying to add secondary replica node get this error
from newrelic
MongoError: server mongo6.prod.close5.com:27017 sockets closed

looks like it's replicating fine but having problems from application front-end

below is the configuration

rs0:SECONDARY> db.isMaster()

{ "hosts" : [ "172.31.29.208:27017", "mongo2.prod.close5.com:27017", "mongo4.prod.close5.com:27017", "mongo1.prod.close5.com:27017" ], "passives" : [ "mongo5.prod.close5.com:27017" ], "arbiters" : [ "mongo-arb.prod.close5.com:30000" ], "setName" : "rs0", "setVersion" : 112, "ismaster" : false, "secondary" : true, "primary" : "172.31.29.208:27017", "me" : "mongo1.prod.close5.com:27017", "maxBsonObjectSize" : 16777216, "maxMessageSizeBytes" : 48000000, "maxWriteBatchSize" : 1000, "localTime" : ISODate("2016-05-31T22:38:39.155Z"), "maxWireVersion" : 4, "minWireVersion" : 0, "ok" : 1 }