System.IO.IOException: Unable to read data from the transport connection

[dyardyGIT]

Using IIS, ASP.NET Core 2.2 and RestSharp V106.6.10 via Nuget on multiple servers getting exceptions after a period of time. My API calls with RestSharp work for a while then all of a sudden they start failing with common exception messages such as...

"ErrorException:System.Net.WebException: An error occurred while sending the request. 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.Http.HttpRequestException: An error occurred while sending the request. ---> 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"

This occurs on multiple servers and I have yet to determine the source of the issue.

I have tried to create RestClient per call and also as a singleton with the same exception in both cases. I have also tried using syncrhonously as well as async all the way from the controller to the server call. In all cases I continue to get the above failure messages after a period of time.

Restarting the apppool does not resolve the issue. The only thing that will resolve this is a server reboot. I believe it has something to do with http client connections and reaching some limit but have yet to determine why i continue to have this issue.

Any help would be greatly appreciated.

Code currently looks like...

            var defaultTimeout = 5 * 60 * 1000;
            _restClientTimeout = defaultTimeout;
            _restClientReadWriteTimeout = defaultTimeout;
            _requestTimeout = defaultTimeout;
            _client = new RestClient(_fastFieldBaseUrl);
            _client.Timeout = _restClientTimeout;
            _client.ReadWriteTimeout = _restClientReadWriteTimeout;

            var request = new RestRequest(url, Method.POST);
            request.Timeout = _requestTimeout;
            request.ReadWriteTimeout = _requestTimeout;
            request.AddHeader("Content-Type", "application/json");
            request.AddParameter("body", json, ParameterType.RequestBody);
            try
            {
                var response = await _client.ExecuteTaskAsync(request);
                if (response.StatusCode == HttpStatusCode.Created)
                {
                    return response.RawBytes;
                }
                else
                {
                    var message= $"ExecuteTaskAsync raw bytes is null                    GetResponseMessage(response)}";
                    Log(message, traceIdentifier, null, Microsoft.Extensions.Logging.LogLevel.Error);
                    return null;
                }
            }
            catch (Exception e)
            {
                var message = $"Error: {e.ToString()}";
                Log(message, traceIdentifier, e, Microsoft.Extensions.Logging.LogLevel.Error);
            }

[alexeyzimarev]

Duplicate of #1322

[dyardyGIT]

I read other post, while very similar was there resolution?

[alexeyzimarev]

@dyardyGIT I don't know one but there's no point to having two identical issues.