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IIS 500 Fault From Specific Server

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jakdep

I have run into a bit of a brick wall with this issue and am hoping someone with a bit more expertise on the matter can be of assistance.

We have doing a POST from Server A to an web API hosted on a customer server and getting the following exception:

System.AggregateException: One or more errors occurred. ---> System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.IO.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.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
   at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
   at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
   at System.Net.PooledStream.EndRead(IAsyncResult asyncResult)
   at System.Net.Connection.ReadCallback(IAsyncResult asyncResult)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
   at System.Threading.Tasks.Task`1.get_Result()
   at Infrastructure.Web.WebClient.WebClient.PostJson(String requestUri, Object para)
   at UtilityBelt.Operations.APICaller.btnPost_Click(Object sender, EventArgs e)
---> (Inner Exception #0) System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.IO.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.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
   at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult)
   at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult)
   at System.Net.PooledStream.EndRead(IAsyncResult asyncResult)
   at System.Net.Connection.ReadCallback(IAsyncResult asyncResult)
   --- End of inner exception stack trace ---
   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
   --- End of inner exception stack trace ---<---

The exception occurs on every call from Server A, but for some reason no exception occurs when making when making the same call from my local network or another server.

I can see that the call from Server A is reaching IIS on the customer server, but it looks like it is not even reaching the controller in the web API. Here is the log entry in the IIS log file:

2021-08-12 02:06:06 192.168.0.2 POST /customerAPI/api/users/LocaliseUser - 7878 - 123.123.123.123 - - 500 0 64 129122

After looking into it for a while I enabled the Failed Request Tracing, but could not gain much insight from the produced file which contained a lot of verbose information and the following two warnings:

Tracing Warnings

I saw a possible explanation could be an unhandled exception, but adding in the unhandled exception handler details here did not produce any additional information.

Any suggestions as to what I should look into next to narrow down the cause of the issue?

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Lex Li avatar
vn flag
Lex Li
That kind of socket exceptions is rather common, as TCP/IP stack allows some amount of instability. You should design your code to expect/handle such properly and retry when necessary.
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