a webserver will sometimes get stuck with the following error until the app pool is reset, connectivity to the mongo servers appear fine. what is the problem ? it sounds like the heartbeat stops working.

w3wp.exe Error: 0 : System.TimeoutException: A timeout occured after 30000ms selecting a server using CompositeServerSelector{ Selectors = WritableServerSelector, LatencyLimitingServerSelector

{ AllowedLatencyRange = 00:00:00.0150000 }

}. Client view of cluster state is { ClusterId : "2", ConnectionMode : "ReplicaSet", Type : "ReplicaSet", State : "Disconnected", Servers : [{ ServerId: "

{ ClusterId : 2, EndPoint : "Unspecified/paspirehdb01:27017" }

", EndPoint: "Unspecified/paspirehdb01:27017", State: "Disconnected", Type: "Unknown" }, { ServerId: "

{ ClusterId : 2, EndPoint : "Unspecified/paspirehdb02:27017" }

", EndPoint: "Unspecified/paspirehdb02:27017", State: "Disconnected", Type: "Unknown" }] }.
at MongoDB.Driver.Core.Clusters.Cluster.WaitForDescriptionChangedHelper.HandleCompletedTask(Task completedTask)
at MongoDB.Driver.Core.Clusters.Cluster.WaitForDescriptionChanged(IServerSelector selector, ClusterDescription description, Task descriptionChangedTask, TimeSpan timeout, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Clusters.Cluster.SelectServer(IServerSelector selector, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Bindings.WritableServerBinding.GetWriteChannelSource(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Operations.CreateIndexesOperation.Execute(IWriteBinding binding, CancellationToken cancellationToken)
at MongoDB.Driver.MongoCollectionImpl`1.ExecuteWriteOperation[TResult](IWriteOperation`1 operation, CancellationToken cancellationToken)
at MongoDB.Driver.MongoCollectionImpl`1.MongoIndexManager.CreateMany(IEnumerable`1 models, CancellationToken cancellationToken)
at MongoDB.Driver.MongoIndexManagerBase`1.CreateOne(IndexKeysDefinition`1 keys, CreateIndexOptions options, CancellationToken cancellationToken)