Here is a simple example of how to create a web proxy for a flash file.

Flash has many restrictions for files loaded from a different domain. When you don't have any control over the flash file located on a remote server, a solution might be the creation of a web proxy like the following one:

<%@ Page language="c#" AutoEventWireup="false" Inherits="PhotoSite.util.PreviewPageBase" %>
<%@ Import namespace="System.Net"%>
<%@ Import namespace="System.IO"%>
<script language="C#" runat="server">
override protected void OnInit(EventArgs e)
{
    string sURL = Request["path"];
    
    if(sURL == null) return;

    WebRequest request;
    request = WebRequest.Create(sURL);
    
    WebProxy myProxy = new WebProxy("proxy",80);
    myProxy.BypassProxyOnLocal = true;

    request.Proxy = WebProxy.GetDefaultProxy();

    this.Response.ContentType = "application/x-shockwave-flash";
    this.Response.AddHeader("Content-Type", "application/x-shockwave-flash");
    // set the content disposition
    this.Response.AddHeader("Content-Disposition", "inline;filename=digitalAlbum_v1_7_2.swf");


    using(Stream stream = request.GetResponse().GetResponseStream())
    {
        this.Response.BinaryWrite(StreamToByteArray(stream));
    }
}

public static byte[] StreamToByteArray (Stream stream)
{
    byte[] buffer = new byte[32768];
    using (MemoryStream ms = new MemoryStream())
    {
        while (true)
        {
            int read = stream.Read (buffer, 0, buffer.Length);
            if (read <= 0)
                return ms.ToArray();
            ms.Write (buffer, 0, read);
        }
    }
}
</script>