Crash trying to use http

[teknikal-wizard]

When I try to run the Clima example, I got the error

Unhandled Exception: System.AggregateException: One or more errors occurred. (Network subsystem is down) ---> System.Net.Http.HttpRequestException: Network subsystem is down ---> System.Net.Sockets.SocketException: Network subsystem is down

The board is connecting to the local network successfully (the light goes blue then green) but then I get the crash trying to request data.

A person in the Slack ('Unreal') told me this was a known issue with the network stack as they had faced it too but I couldn't see a report so I have logged it here.

Here's the full stack trace:

Unhandled Exception: System.AggregateException: One or more errors occurred. (Network subsystem is down) ---> System.Net.Http.HttpRequestException: Network subsystem is down ---> System.Net.Sockets.SocketException: Network subsystem is down
  at System.Net.Sockets.Socket..ctor (System.Net.Sockets.AddressFamily addressFamily, System.Net.Sockets.SocketType socketType, System.Net.Soc[27/08/2021 12:58:35] Meadow StdOut: ets.ProtocolType protocolType) <0xc171b2f0 + 0x0007e> in <21f99a79f55e4fb0ada6126aa016bfb7>:0 
  at System.Net.Sockets.DualSocketMultipleConnectAsync..ctor (System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType) <0xc1702138 + 0x00024> in <21f99a79f55e4fb0ada6126aa016bfb7>:0 
  at System.Net.Sockets.Socket.ConnectAsync (System.Net.Sockets.SocketType[27/08/2021 12:58:35] Meadow StdOut: socketType, System.Net.Sockets.ProtocolType protocolType, System.Net.Sockets.SocketAsyncEventArgs e) <0xc1701df8 + 0x00084> in <21f99a79f55e4fb0ada6126aa016bfb7>:0 
  at System.Net.Http.ConnectHelper.ConnectAsync (System.String host, System.Int32 port, System.Threading.CancellationToken cancellationToken) <0xc16fa278 + 0x0008e> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
   --- End o[27/08/2021 12:58:35] Meadow StdOut:  inner exception stack trace ---
  at System.Net.Http.ConnectHelper.ConnectAsync (System.String host, System.Int32 port, System.Threading.CancellationToken cancellationToken) <0xc16fa278 + 0x002d0> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at System.Threading.Tasks.ValueTask`1[TResult].get_Result () <0xc1718d80 + 0x00034> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at System.Net.H[27/08/2021 12:58:35] Meadow StdOut: tp.HttpConnectionPool.CreateConnectionAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) <0xc16ae3f8 + 0x00232> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at System.Threading.Tasks.ValueTask`1[TResult].get_Result () <0xc17cc520 + 0x00034> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at System.Net.Http.HttpConnectionPool.WaitForCr[27/08/2021 12:58:35] Meadow StdOut: atedConnectionAsync (System.Threading.Tasks.ValueTask`1[TResult] creationTask) <0xc17cbdc8 + 0x0013e> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at System.Threading.Tasks.ValueTask`1[TResult].get_Result () <0xc17cc520 + 0x00034> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at System.Net.Http.HttpConnectionPool.SendWithRetryAsync (System.Net.Http.HttpRequestMessage request, System.Bo[27/08/2021 12:58:35] Meadow StdOut: lean doRequestAuth, System.Threading.CancellationToken cancellationToken) <0xc169a970 + 0x000fa> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at System.Net.Http.RedirectHandler.SendAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) <0xc16809d0 + 0x00144> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at System.Net.Http.HttpClient.Fin[27/08/2021 12:58:35] Meadow StdOut: shSendAsyncBuffered (System.Threading.Tasks.Task`1[TResult] sendTask, System.Net.Http.HttpRequestMessage request, System.Threading.CancellationTokenSource cts, System.Boolean disposeCts) <0xc17d1d00 + 0x0027c> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at FSharp.Control.Tasks.TaskBuilder.bindTask[a,b] (System.Threading.Tasks.Task`1[TResult] task, Microsoft.FSharp.Core.FSharpFunc`2[27/08/2021 12:58:35] Meadow StdOut: T,TResult] continuation) <0xc17d29c8 + 0x0004a> in <5b9ee785698306f6a745038385e79e5b>:0 
  at Climate+fetchTempReadings@49-1.Invoke (System.Net.Http.HttpClient _arg1) <0xc1612b20 + 0x0006a> in <e92d0dbcb54e4203a0b4407818901646>:0 
  at FSharp.Control.Tasks.TaskBuilder+using@213[a,a].Invoke (Microsoft.FSharp.Core.Unit unitVar0) <0xc16127d8 + 0x00010> in <5b9ee785698306f6a745038385e[27/08/2021 12:58:35] Meadow StdOut: 9e5b>:0 
  at FSharp.Control.Tasks.TaskBuilder.tryFinally[a] (Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] step, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] fin) <0xc1612528 + 0x00032> in <5b9ee785698306f6a745038385e79e5b>:0 
  at FSharp.Control.Tasks.TaskBuilder.using[a,a] (a disp, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] body) <0xc1611f78 + 0x0002c> in <5b9ee785698306f6a[27/08/2021 12:58:35] Meadow StdOut: 45038385e79e5b>:0 
  at Climate+fetchTempReadings@48.Invoke (Microsoft.FSharp.Core.Unit unitVar) <0xc1607b90 + 0x00030> in <e92d0dbcb54e4203a0b4407818901646>:0 
  at FSharp.Control.Tasks.TaskBuilder.run[a] (Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] firstStep) <0xc1596038 + 0x0000c> in <5b9ee785698306f6a745038385e79e5b>:0 
   --- End of inner exception stack trace ---
  at Syst[27/08/2021 12:58:36] Meadow StdOut: m.Threading.Tasks.Task.ThrowIfExceptional (System.Boolean includeTaskCanceledExceptions) <0xc17db0d0 + 0x00022> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at System.Threading.Tasks.Task`1[TResult].GetResultCore (System.Boolean waitCompletionNotification) <0xc17daf48 + 0x00062> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at System.Threading.Tasks.Task`1[TResult].get_Result () <0xc17[27/08/2021 12:58:36] Meadow StdOut: aee8 + 0x0002a> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at Program+MeadowApp..ctor () <0xc0bff978 + 0x001da> in <e92d0dbcb54e4203a0b4407818901646>:0 
  at Program.main (System.String[] argv) <0xc083d3c8 + 0x00002> in <e92d0dbcb54e4203a0b4407818901646>:0 
---> (Inner Exception #0) System.Net.Http.HttpRequestException: Network subsystem is down ---> System.Net.Sockets.SocketExcep[27/08/2021 12:58:36] Meadow StdOut: ion: Network subsystem is down
  at System.Net.Sockets.Socket..ctor (System.Net.Sockets.AddressFamily addressFamily, System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType) <0xc171b2f0 + 0x0007e> in <21f99a79f55e4fb0ada6126aa016bfb7>:0 
  at System.Net.Sockets.DualSocketMultipleConnectAsync..ctor (System.Net.Sockets.SocketType socketType, System.Net[27/08/2021 12:58:36] Meadow StdOut: Sockets.ProtocolType protocolType) <0xc1702138 + 0x00024> in <21f99a79f55e4fb0ada6126aa016bfb7>:0 
  at System.Net.Sockets.Socket.ConnectAsync (System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType, System.Net.Sockets.SocketAsyncEventArgs e) <0xc1701df8 + 0x00084> in <21f99a79f55e4fb0ada6126aa016bfb7>:0 
  at System.Net.Http.ConnectHelper.ConnectAs[27/08/2021 12:58:36] Meadow StdOut: nc (System.String host, System.Int32 port, System.Threading.CancellationToken cancellationToken) <0xc16fa278 + 0x0008e> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
   --- End of inner exception stack trace ---
  at System.Net.Http.ConnectHelper.ConnectAsync (System.String host, System.Int32 port, System.Threading.CancellationToken cancellationToken) <0xc16fa278 + 0x002d0> in <d3a6c6c[27/08/2021 12:58:36] Meadow StdOut: 11a644b1a852e9792f1af95b>:0 
  at System.Threading.Tasks.ValueTask`1[TResult].get_Result () <0xc1718d80 + 0x00034> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at System.Net.Http.HttpConnectionPool.CreateConnectionAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) <0xc16ae3f8 + 0x00232> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  [27/08/2021 12:58:36] Meadow StdOut: t System.Threading.Tasks.ValueTask`1[TResult].get_Result () <0xc17cc520 + 0x00034> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync (System.Threading.Tasks.ValueTask`1[TResult] creationTask) <0xc17cbdc8 + 0x0013e> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at System.Threading.Tasks.ValueTask`1[TResult].get_Result () <0x[27/08/2021 12:58:36] Meadow StdOut: 17cc520 + 0x00034> in <843bd420d20a407aa10d62e4764eaf5d>:0 
  at System.Net.Http.HttpConnectionPool.SendWithRetryAsync (System.Net.Http.HttpRequestMessage request, System.Boolean doRequestAuth, System.Threading.CancellationToken cancellationToken) <0xc169[27/08/2021 12:58:36] Meadow StdOut: a970 + 0x000fa> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at System.Net.Http.RedirectHandler.SendAsync (System.Net.Http.HttpRequestMessage request, System.Threading.CancellationToken cancellationToken) <0xc16809d0 + 0x00144> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at System.Net.Http.HttpClient.FinishSendAsyncBuffered (System.Threading.Tasks.Task`1[TResult] sendTask, System.Net[27/08/2021 12:58:36] Meadow StdOut: Http.HttpRequestMessage request, System.Threading.CancellationTokenSource cts, System.Boolean disposeCts) <0xc17d1d00 + 0x0027c> in <d3a6c6c611a644b1a852e9792f1af95b>:0 
  at FSharp.Control.Tasks.TaskBuilder.bindTask[a,b] (System.Threading.Tasks.Task`1[TResult] task, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] continuation) <0xc17d29c8 + 0x0004a> in <5b9ee785698306f6a745038385e7[27/08/2021 12:58:36] Meadow StdOut: e5b>:0 
  at Climate+fetchTempReadings@49-1.Invoke (System.Net.Http.HttpClient _arg1) <0xc1612b20 + 0x0006a> in <e92d0dbcb54e4203a0b4407818901646>:0 
  at FSharp.Control.Tasks.TaskBuilder+using@213[a,a].Invoke (Microsoft.FSharp.Core.Unit unitVar0) <0xc16127d8 + 0x00010> in <5b9ee785698306f6a745038385e79e5b>:0 
  at FSharp.Control.Tasks.TaskBuilder.tryFinally[a] (Microsoft.FSharp.C[27/08/2021 12:58:36] Meadow StdOut: re.FSharpFunc`2[T,TResult] step, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] fin) <0xc1612528 + 0x00032> in <5b9ee785698306f6a745038385e79e5b>:0 
  at FSharp.Control.Tasks.TaskBuilder.using[a,a] (a disp, Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] body) <0xc1611f78 + 0x0002c> in <5b9ee785698306f6a745038385e79e5b>:0 
  at Climate+fetchTempReadings@48.Invoke (Microsoft.FSharp.Co[27/08/2021 12:58:36] Meadow StdOut: e.Unit unitVar) <0xc1607b90 + 0x00030> in <e92d0dbcb54e4203a0b4407818901646>:0 
  at FSharp.Control.Tasks.TaskBuilder.run[a] (Microsoft.FSharp.Core.FSharpFunc`2[T,TResult] firstStep) <0xc1596038 + 0x0000c> in <5b9ee785698306f6a745038385e79e5b>:0 <---

[PureWeen]

@NevynUK I think this is the error I'm seeing with the project I sent you. Occasionally I'll get these errors but other times it'll just stop responding. If there's a way to grab any useful info when it seems to lockup let me know

[NevynUK]

Closing as this is an old problem and has not been reproduced recently.