WCF Rest ERR_CONNECTION_RESET not large response

Question

The error code is absolutely terrible, ERR_CONNECTION_RESET has a host of causes and the causes that I found on other questions were related to having too small of a MaxRequestLength for large web service calls. The data I was returning was only a couple of kB though, so this couldn't be the issue.

Here is my interface code

[WebGet(RequestFormat = WebMessageFormat.Json,
  BodyStyle = WebMessageBodyStyle.WrappedRequest,
  ResponseFormat = WebMessageFormat.Json,
  UriTemplate = "GetReportByID?ReportID={ReportID}")]
[OperationContract]
UsageReport GetReportByID(int ReportID);

This was the implementation

public UsageReport GetReportByID(int ReportID)
{
    return new UsageReport(ReportID);
}

And this was the class code for UsageReport

[DataContract]
public class UsageReport
{
 [DataMember]
List<UsageItem> RL;

  public UsageReport(int reportID)
{
       RL = new List<UsageItem>();

        using (SqlDataReader dr = DBUtility.ExecuteReader(cmd, "DBString"))
        {
            while (dr.Read())
            {

                ItemNumber = dr["ItemID"] as int? ?? 0;
                RL.Add(new UsageItem(ItemNumber));
            }
            dr.Close();
        }
}



public class UsageItem
{
    int ItemNumber;

    public UsageItem(int ItemNumber)
    {
        this.ItemNumber = ItemNumber;

    }

}

score 5 · Accepted Answer · answered Oct 22 '14 at 18:07

5

The problem was my UsageItem class, I was missing the necessary DataContract and DataMember fields.

[DataContract]
public class UsageItem
{
[DataMember]
int ItemNumber;

public UsageItem(int ItemNumber)
  {
    this.ItemNumber = ItemNumber;


  }

}

answered Oct 22 '14 at 18:07

DaneEdw

446
1
8
18

Is there a way to use WCF services without specifying `DataContract` and `DataMember`, because lot of classes? – Rasool Ghafari Apr 20 '15 at 17:19
http://stackoverflow.com/questions/4836683/when-to-use-datacontract-and-datamember-attributes this answer claims that you can, but apparently you lose a lot of benefits when you do so. – DaneEdw Apr 21 '15 at 16:01
please check this my question , i want to use `JSON.Net` and `WCF` toghether. http://stackoverflow.com/questions/29754874/how-to-use-wcf-services-without-datacontract-and-datamember – Rasool Ghafari Apr 21 '15 at 20:50
2

Thank you so much, DaneEdw. I wasted 4 hours trying to find out why my connection was being reset. Your answer saved me. – Jason Williams Oct 19 '16 at 14:13
If applying a DataMember to properties, it must contain a `set` for it to serialise (ie, it cannot be readonly). Tip: The set can be blank ;) – Radderz Feb 13 '17 at 14:50

OfirD · Answer 2 · 2020-06-28T15:00:56.140

I'd like to add a solution related to a case where WCF is used on the server side:

Add diagnostics to web.config (taken from here):

   <?xml version="1.0" encoding="UTF-8"?>
   <configuration>
     <system.diagnostics>
       <sources>
          <source name="System.Net" switchValue="Verbose">
              <listeners>
                  <add name="SystemNetTrace"/>
              </listeners>
          </source>
          <source name="System.ServiceModel" switchValue="Verbose, ActivityTracing" propagateActivity="true">
              <listeners>
                  <add name="wcftrace" />
              </listeners>
          </source>
          <source name="System.ServiceModel.MessageLogging" switchValue="Verbose, ActivityTracing">       
              <listeners>
                  <add name="wcfmessages" />
              </listeners>
          </source>
          <source name="System.Runtime.Serialization" switchValue="Verbose">
              <listeners>
                  <add name="wcfmessages" />
              </listeners>
          </source>
       </sources>
       <sharedListeners> 
           <add name="SystemNetTrace" type="System.Diagnostics.TextWriterTraceListener" traceOutputOptions="LogicalOperationStack, DateTime, Timestamp, Callstack" initializeData="C:\Traces\System_Net.txt" />
           <add name="wcftrace" type="System.Diagnostics.XmlWriterTraceListener" traceOutputOptions="LogicalOperationStack, DateTime, Timestamp, Callstack" initializeData="C:\Traces\WCFTrace.svclog" />
           <add name="wcfmessages" type="System.Diagnostics.XmlWriterTraceListener" traceOutputOptions="LogicalOperationStack, DateTime, Timestamp, Callstack" initializeData="C:\Traces\WCFMessages.svclog" />
       </sharedListeners>
       <trace autoflush="true" />
     </system.diagnostics>
   </configuration>

Reproduce the error, then go to the trace folder (C:\Traces, in this example). There will be 2 svclog files there: WCFMessages.svclog and WCFTrace.svclog.
Open the file named WCFMessages.svclog. A "Microsoft Service Trace Viewer" window will open, showing errors with a red color.
If no errors are displayed, open WCFTrace.svclog, and the errors (in red) would be there.

In my case, it was a System.Runtime.Serialization error because of a lack of DataContract attribute.

WCF Rest ERR_CONNECTION_RESET not large response

2 Answers2

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