使用MongoDb C＃驱动程序的套接字超时异常

Question

我有一个API方法，当命中时，查询MongoDb集合中与给定id相关的所有条目（通常是2或3个结果。）同样的查询在我的项目的其他地方进行，没有错误，但是当它被创建时通过这个API方法，我得到频繁的Socket Exceptions如下：

堆栈跟踪：

   [IOException: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.]
    System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size):241
    MongoDB.Bson.IO.ByteBufferFactory.LoadFrom(Stream stream):37
    MongoDB.Driver.Internal.MongoConnection.ReceiveMessage[TDocument](BsonBinaryReaderSettings readerSettings, IBsonSerializer serializer, IBsonSerializationOptions serializationOptions):174
    MongoDB.Driver.Operations.QueryOperation`1.GetFirstBatch(IConnectionProvider connectionProvider):204
    MongoDB.Driver.Operations.QueryOperation`1.Execute(IConnectionProvider connectionProvider):0
    HireSpaceVenue.Data.BookingsData.GetBookingLines(IMongoQuery query) in c:\a\src\HireSpaceVenue.Data\BookingsData.cs:474
    HireSpaceVenue.Data.BookingsData.HireSpaceVenue.Data.Interfaces.IBookingsData.GetBookingLinesByBookingId(String bookingId) in c:\a\src\HireSpaceVenue.Data\BookingsData.cs:147
    HireSpaceVenueWeb.Controllers.EnquiriesController.GetUpdate(String bookingId) in c:\a\src\HireSpaceVenueWeb\Controllers\EnquiriesController.cs:130

[SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond]
    System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size):172

代码：

    //build query
    ...

    // initialise the connection
    MongoClient client = new MongoClient(_mongoConnectionString);
    MongoServer server = client.GetServer();
    MongoDatabase database = server.GetDatabase(_databaseName);

    // get the collection
   MongoCollection<LazyBsonDocument> bookinglines =
   database.GetCollection<LazyBsonDocument>("bookinglines");

   // query the collection
   MongoCursor<LazyBsonDocument> mongoCursor = bookinglines.Find(query);

   // do something with the retrieved data
   ...

这段代码包含在一个从多个地方调用的方法中，但是当我从API方法调用它时，我似乎只能得到超时问题。

任何解释/可能的原因？