RDLC report Error: Unable to connect to the remote server

Dear Sir 

I am tring to open report but report is not loading and show below error

ERROR :

• Unable to connect to the remote server
• No connection could be made because the target machine actively refused it 127.0.0.1:80

protected void displaytest()
{
    ConnectionStringFunction();
    SqlCn = new SqlConnection(ConPath);
    SqlCn.Open();

    SqlCm = new SqlCommand("select * from brandmaster", SqlCn);
    SqlDa = new SqlDataAdapter(SqlCm);
    SqlDt = new DataTable();
    SqlDa.Fill(SqlDt);

    ReportViewer1.LocalReport.DataSources.Clear();
    ReportDataSource rds = new ReportDataSource("DataSet1", SqlDt);
    ReportViewer1.LocalReport.ReportPath = Server.MapPath("~/Report/AtestReport.rdlc");
    ReportViewer1.LocalReport.DataSources.Add(rds);
    ReportViewer1.LocalReport.Refresh();
}

Process is going perfectly in debug