I created a class to submit an xml document to a webpage.

When I use my class in a console application, everything submits correctly.

However, when I attempt to use my class from an asp.net webpage, then it
always gives me this exception
The underlying connection was closed: Unable to connect to the remote server.

I am using the System.Net namespace
Code is below:

I always get the exception on this line:
using (Stream requestStream = request.GetRequestStream())

Thanks in advance for any hints. tips to solve this problem

public string SubmitIRAlerts(string url)
{
    string returnValue;
    StreamReader sr;
    ASCIIEncoding enc = new ASCIIEncoding();
    byte[] bytes = enc.GetBytes(this.XmlData);
    HttpWebRequest request  = WebRequest.Create(url) as HttpWebRequest;
    request.Method = "POST";
    request.ContentLength = bytes.Length;
    request.ContentType = "text/xml";
    using (Stream requestStream = request.GetRequestStream())
    // always produces error on code above
    {
        requestStream.Write(bytes, 0, bytes.Length);
    }
    HttpWebResponse response = (HttpWebResponse) request.GetResponse();
    try
    {
        if (response.StatusCode != HttpStatusCode.OK)
        {
            string message = String.Format("POST failed. Received HTTP {0}",
response.StatusCode);
            throw new ApplicationException(message);
        }
        sr = new StreamReader(response.GetResponseStream());
        try
        {
            returnValue = sr.ReadToEnd();
        }
        finally
        {
            if ( sr != null )
                sr.Close();
        }
    }
    finally
    {               
        if ( response != null )
            response.Close();
    }
    return returnValue;
}