I am using loFtpWebRequest to download a file from a server. Yesterday, I had to adjust the method to support big files such as 2.2 GB. The download works but will fail after 2 hours giving this message:

The underlying connection was closed: An unexpected error occured on a receive.

This happens when the download is at about 55%.

This is a portion of the code which demonstrates the object used for the download:

                ' FTP setup
                loFtpWebRequest = System.Net.FtpWebRequest.Create(New Uri(lcURI))
                loFtpWebRequest.Credentials = New System.Net.NetworkCredential(cUsername, cPassword)
                loFtpWebRequest.Method = System.Net.WebRequestMethods.Ftp.DownloadFile
                loFtpWebRequest.UseBinary = True
                loFtpWebRequest.UsePassive = True

                loFtpWebResponse = loFtpWebRequest.GetResponse()

                loStream = loFtpWebResponse.GetResponseStream()

I am not sure if this could be related since I changed the mode to UsePassive=True yesterday.