WCF Rest ERR_CONNECTION_RESET not a big answer

The error code is absolutely horrible, ERR_CONNECTION_RESET has many reasons, and the reasons I found on other questions were because the MaxRequestLength was too small for large web service calls. The data I was returning was only a couple of kB, so this couldn't be a problem.

Here is my interface code

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

      

        
        
        
      

    

It was implementation

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

      

        
        
        
      

    

And that 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;

    }

}