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When the connection between client and server is impossible the exception is rethrown inside a System.Timeout exception.
I believe encapsulating the root cause of the problem hides the root cause of the problem, it also makes searching for hints over internet - S/O or here confusing as several exception are wrapped similarly.
System.TimeoutException: A timeout occurred after 30000ms selecting a server using CompositeServerSelector{ Selectors = MongoDB.Driver.MongoClient+AreSessionsSupportedServerSelector, LatencyLimitingServerSelector
{ AllowedLatencyRange = 00:00:00.0150000 }
, OperationsCountServerSelector }. Client view of cluster state is { ClusterId : "1", ConnectionMode : "ReplicaSet", Type : "ReplicaSet", State : "Disconnected", Servers : [{ ServerId: "
{ ClusterId : 1, EndPoint : "Unspecified/cluster0-shard-00-00.m6alu.mongodb.net:27017" }
", EndPoint: "Unspecified/cluster0-shard-00-00.m6alu.mongodb.net:27017", ReasonChanged: "Heartbeat", State: "Disconnected", ServerVersion: , TopologyVersion: , Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server.
---> MongoDB.Driver.MongoConnectionException: An exception occurred while receiving a message from the server.
---> System.IO.EndOfStreamException: Attempted to read past the end of the stream.
at MongoDB.Driver.Core.Misc.StreamExtensionMethods.ReadBytes(Stream stream, Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(CancellationToken cancellationToken)
--- End of inner exception stack trace —
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(Int32 responseTo, CancellationToken cancellationToken)
— End of stack trace from previous location —
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(Int32 responseTo, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveMessage(Int32 responseTo, IMessageEncoderSelector encoderSelector, MessageEncoderSettings messageEncoderSettings, CancellationToken cancellationToken)
at MongoDB.Driver.Core.WireProtocol.CommandUsingQueryMessageWireProtocol`1.Execute(IConnection connection, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.HelloHelper.GetResult(IConnection connection, CommandWireProtocol`1 helloProtocol, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.ConnectionInitializer.SendHello(IConnection connection, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.OpenHelper(CancellationToken cancellationToken)
--- End of inner exception stack trace —
at MongoDB.Driver.Core.Connections.BinaryConnection.OpenHelper(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.Open(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Servers.ServerMonitor.InitializeConnection(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Servers.ServerMonitor.Heartbeat(CancellationToken cancellationToken)", LastHeartbeatTimestamp: "2022-06-16T06:54:19.2590694Z", LastUpdateTimestamp: "2022-06-16T06:54:19.2590697Z" }, { ServerId: "
{ ClusterId : 1, EndPoint : "Unspecified/cluster0-shard-00-01.m6alu.mongodb.net:27017" }
", EndPoint: "Unspecified/cluster0-shard-00-01.m6alu.mongodb.net:27017", ReasonChanged: "Heartbeat", State: "Disconnected", ServerVersion: , TopologyVersion: , Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server.
---> MongoDB.Driver.MongoConnectionException: An exception occurred while receiving a message from the server.
---> System.IO.EndOfStreamException: Attempted to read past the end of the stream.
at MongoDB.Driver.Core.Misc.StreamExtensionMethods.ReadBytes(Stream stream, Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(CancellationToken cancellationToken)
--- End of inner exception stack trace —
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(Int32 responseTo, CancellationToken cancellationToken)
— End of stack trace from previous location —
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(Int32 responseTo, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveMessage(Int32 responseTo, IMessageEncoderSelector encoderSelector, MessageEncoderSettings messageEncoderSettings, CancellationToken cancellationToken)
at MongoDB.Driver.Core.WireProtocol.CommandUsingQueryMessageWireProtocol`1.Execute(IConnection connection, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.HelloHelper.GetResult(IConnection connection, CommandWireProtocol`1 helloProtocol, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.ConnectionInitializer.SendHello(IConnection connection, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.OpenHelper(CancellationToken cancellationToken)
--- End of inner exception stack trace —
at MongoDB.Driver.Core.Connections.BinaryConnection.OpenHelper(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.Open(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Servers.ServerMonitor.InitializeConnection(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Servers.ServerMonitor.Heartbeat(CancellationToken cancellationToken)", LastHeartbeatTimestamp: "2022-06-16T06:54:18.3550509Z", LastUpdateTimestamp: "2022-06-16T06:54:18.3550512Z" }, { ServerId: "
{ ClusterId : 1, EndPoint : "Unspecified/cluster0-shard-00-02.m6alu.mongodb.net:27017" }
", EndPoint: "Unspecified/cluster0-shard-00-02.m6alu.mongodb.net:27017", ReasonChanged: "Heartbeat", State: "Disconnected", ServerVersion: , TopologyVersion: , Type: "Unknown", HeartbeatException: "MongoDB.Driver.MongoConnectionException: An exception occurred while opening a connection to the server.
---> MongoDB.Driver.MongoConnectionException: An exception occurred while receiving a message from the server.
---> System.IO.EndOfStreamException: Attempted to read past the end of the stream.
at MongoDB.Driver.Core.Misc.StreamExtensionMethods.ReadBytes(Stream stream, Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(CancellationToken cancellationToken)
--- End of inner exception stack trace —
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(Int32 responseTo, CancellationToken cancellationToken)
— End of stack trace from previous location —
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveBuffer(Int32 responseTo, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.ReceiveMessage(Int32 responseTo, IMessageEncoderSelector encoderSelector, MessageEncoderSettings messageEncoderSettings, CancellationToken cancellationToken)
at MongoDB.Driver.Core.WireProtocol.CommandUsingQueryMessageWireProtocol`1.Execute(IConnection connection, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.HelloHelper.GetResult(IConnection connection, CommandWireProtocol`1 helloProtocol, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.ConnectionInitializer.SendHello(IConnection connection, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.OpenHelper(CancellationToken cancellationToken)
--- End of inner exception stack trace —
at MongoDB.Driver.Core.Connections.BinaryConnection.OpenHelper(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Connections.BinaryConnection.Open(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Servers.ServerMonitor.InitializeConnection(CancellationToken cancellationToken)
at MongoDB.Driver.Core.Servers.ServerMonitor.Heartbeat(CancellationToken cancellationToken)", LastHeartbeatTimestamp: "2022-06-16T06:54:19.9015049Z", LastUpdateTimestamp: "2022-06-16T06:54:19.9015051Z" }] }.
at MongoDB.Driver.Core.Clusters.Cluster.ThrowTimeoutException(IServerSelector selector, ClusterDescription description)
at MongoDB.Driver.Core.Clusters.Cluster.WaitForDescriptionChangedHelper.HandleCompletedTask(Task completedTask)
at MongoDB.Driver.Core.Clusters.Cluster.WaitForDescriptionChangedAsync(IServerSelector selector, ClusterDescription description, Task descriptionChangedTask, TimeSpan timeout, CancellationToken cancellationToken)
at MongoDB.Driver.Core.Clusters.Cluster.SelectServerAsync(IServerSelector selector, CancellationToken cancellationToken)
at MongoDB.Driver.MongoClient.AreSessionsSupportedAfterServerSelectionAsync(CancellationToken cancellationToken)
at MongoDB.Driver.MongoClient.AreSessionsSupportedAsync(CancellationToken cancellationToken)
at MongoDB.Driver.MongoClient.StartImplicitSessionAsync(CancellationToken cancellationToken)
at MongoDB.Driver.MongoCollectionImpl`1.UsingImplicitSessionAsync[TResult](Func`2 funcAsync, CancellationToken cancellationToken)
at MongoDB.Driver.IAsyncCursorSourceExtensions.ToListAsync[TDocument](IAsyncCursorSource`1 source, CancellationToken cancellationToken)
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