HttpWebRequest.GetResponse() Always Timing Out When Trying to Post File

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C#

Hi !
I'm having an issue when trying to post a file to a php script.

I know 100% sure that the URL is correct and the php script is accessible. I know 100% that the file I'm trying to upload exists.

When I try and upload, the .GetResponse() method times out. Sometimes it throws the exception: "The underlying connection was closed: An unexpected error occurred on a receive"

Here's my file upload code:

public static string PostData(string strUrl, string strFileToUpload)
{
    try
    {
        const string strFileFormName = "file";
        var oUri = new Uri(strUrl);
        var strBoundary = "----------" + DateTime.Now.Ticks.ToString("x");

        // The trailing boundary string
        var boundaryBytes = Encoding.ASCII.GetBytes("\r\n--" + strBoundary + "\r\n");

        // The post message header
        var sb = new StringBuilder();
        sb.Append("--");
        sb.Append(strBoundary);
        sb.Append("\r\n");
        sb.Append("Content-Disposition: form-data; name=\"");
        sb.Append(strFileFormName);
        sb.Append("\"; filename=\"");
        sb.Append(Path.GetFileName(strFileToUpload));
        sb.Append("\"");
        sb.Append("\r\n");
        sb.Append("Content-Type: ");
        sb.Append("application/octet-stream");
        sb.Append("\r\n");
        sb.Append("\r\n");
        var strPostHeader = sb.ToString();
        var postHeaderBytes = Encoding.UTF8.GetBytes(strPostHeader);

        // The WebRequest
        var oWebrequest = (HttpWebRequest)WebRequest.Create(oUri);
        oWebrequest.ContentType = "multipart/form-data; boundary=" + strBoundary;
        oWebrequest.Method = "POST";
        oWebrequest.Timeout = Timeout.Infinite;
        oWebrequest.KeepAlive = true;
        // This is important, otherwise the whole file will be read to memory anyway...
        oWebrequest.AllowWriteStreamBuffering = true;

        // Get a FileStream and set the final properties of the WebRequest
        var oFileStream = new FileStream(strFileToUpload, FileMode.Open, FileAccess.Read);
        var length = postHeaderBytes.Length + oFileStream.Length + boundaryBytes.Length;
        oWebrequest.ContentLength = length;
        var oRequestStream = oWebrequest.GetRequestStream();

        // Write the post header
        oRequestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

        // Stream the file contents in small pieces (4096 bytes, max).
        //byte[] buffer = new Byte[checked((uint)Math.Min(4096, (int)oFileStream.Length))];
        var buffer = new Byte[checked((uint)oFileStream.Length)];
        var bytesRead = 0;
        while ((bytesRead = oFileStream.Read(buffer, 0, buffer.Length)) != 0)
            oRequestStream.Write(buffer, 0, bytesRead);
        oFileStream.Close();

        // Add the trailing boundary
        oRequestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
        var oWResponse = oWebrequest.GetResponse();
        var s = oWResponse.GetResponseStream();
        if (s != null)
        {
            var sr = new StreamReader(s);
            var sReturnString = sr.ReadToEnd();

            // Clean up
            oFileStream.Close();
            oRequestStream.Close();
            s.Close();
            sr.Close();

            return sReturnString;
        }
    }
  catch { return String.Empty; }
    return String.Empty;
}

here's my PHP code on the server end:

<?php
require('vars.php');
   $dbHost     = DB_HOST;		// MySQL host
   $dbUser     = DB_USER;	// MySQL username
   $dbPass     = DB_PASSWORD;	// MySQL password
   $dbDatabase = DB_NAME;	// MySQL database name
	function connect_database() {
		global $dbHost, $dbUser, $dbPass, $dbDatabase;
		$mysql = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
		if (!$mysql) {
			$html .= "Database Error".$header."Can not connect to database, please check the configuration.".$footer;
			die($html);
		}
		if (!mysql_select_db($dbDatabase, $mysql)) {
			mysql_close($mysql);
			$html .= "Database Error".$header."Can not select '".$dbDatabase."' database, please check the configuration.".$footer;
			die($html);
		}
		return $mysql;
	}
	connect_database();
			$ID = getRandomString();
			$Location = "stats/".$ID.".html";
			if(is_uploaded_file($_FILES['file']['tmp_name']))
			{
				if (move_uploaded_file($_FILES['file']['tmp_name'][0], $Location)) {
					mysql_query("INSERT INTO `user_stat_links` (`s_id`)VALUES('".$ID."')")
						or die(mysql_error());
					echo "http://myurl.com/stats/?id=".$ID;
					exit;
				}
			}
			echo "error";
?>

I'm extremely baffled by this. I've used this c# code before to upload files and it has worked 100% fine.

Please help!