Getting '401 Unauthorized' from remote Server when ran in Production

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C#

XML

MVC

Hi All,

I'm sending XML data to a company using a WebRequest. When I run the application from my local machine it works flawlessly. However, once I promote the same code to production It's spotty at best. A lot of times it simply fails and the error message I get is "The remote server returned an error: (401) Unauthorized". Sometimes I get a timeout message as well. Any ideas? Here is the offending code:

private XmlUtil GetXMLResponse(XmlUtil xmlreq)
{
    string url = SystemConfig.SilverPopAPIURL + JSession + "?xml=" + xmlreq.OuterXml;

    _TransactionLog.AppendFormat("{0} : sent '{1}' to SilverPop,\r\n", DateTime.Now, url);

    WebRequest request = WebRequest.Create(url);
    try
    {
        using (WebResponse response = request.GetResponse())
        {
            using (Stream stream = response.GetResponseStream())
            {
                StreamReader reader = new StreamReader(stream, Encoding.UTF8);
                XmlUtil rtn = new XmlUtil(reader.ReadToEnd());

                _TransactionLog.AppendFormat("{0} : received '{1}' from SilverPop,\r\n", DateTime.Now, rtn.OuterXml);

                return rtn;
            }
        }
    }
    catch (Exception ex)
    {
        _TransactionLog.AppendFormat("{0} : exception '{1}' with SilverPop,\r\n", DateTime.Now, ex.Message);
        throw;
    }
}