Unable to add shard on 3.7.5 sharded cluster with mmapv1 shard

Start up a 3-node shard on mmapv1 Initiate repl set: > rs.initiate({_id: "a", "members" : [ {"_id" : 0, host : "louisamac:9001"}, {_id: 1, host: "louisamac:9002"}, {_id: 2, host: "louisamac:9003"} ] }) { "ok" : 1, "operationTime" : Timestamp(1524673861, 1), "$clusterTime" : { "clusterTime" : Timestamp(1524673861, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } } } Start up a 3-node csrs Initiate csrs > rs.initiate({configsvr: true, protocolVersion:1, _id: "csrs", "members" : [ {"_id" : 0, host : "louisamac:9007"}, {_id: 1, host: "louisamac:9008"}, {_id: 2, host: "louisamac:9009"} ] }) { "ok" : 1, "operationTime" : Timestamp(1524674021, 1), "$gleStats" : { "lastOpTime" : Timestamp(1524674021, 1), "electionId" : ObjectId("000000000000000000000000") }, "$clusterTime" : { "clusterTime" : Timestamp(1524674021, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } }, "lastCommittedOpTime" : Timestamp(0, 0) } Start up mongos Call {{db.runCommand( {"setFeatureCompatibilityVersion" : "4.0"} )}} on mongos Attempt to add a shard mongos> db.runCommand({"addShard" : "a/louisamac:9001,louisamac:9002,louisamac:9003", name: "shard0"}) { "ok" : 0, "errmsg" : "failed to run command { setFeatureCompatibilityVersion: \"4.0\" } when attempting to add shard a/louisamac:9001,louisamac:9002,louisamac:9003 :: caused by :: NetworkInterfaceExceededTimeLimit: timed out", "code" : 96, "codeName" : "OperationFailed", "$clusterTime" : { "clusterTime" : Timestamp(1524674234, 1), "signature" : { "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="), "keyId" : NumberLong(0) } }, "operationTime" : Timestamp(1524674234, 1) }