HTTPWebResponse Error: Unable to read data from the transport connection

Posted on 2009-05-19
Last Modified: 2013-12-17
I have some code for uploading a file to a HTTPS server.  The code works great for files up to about 150 MB (not sure of the exact cutoff).   But when the files get bigger than that, then I get the following exception:

    "Unable to write data to the transport connection:  An existing connection was forcibly
    closed by the remote host"

    The BaseException is:  "Unable to read data from the transport connection"

Other users (outside our network) can already successfully upload files up to almost 1 GB with no problems...  it just my code that's not working...

I've searched the internet for hours and haven't found the answer.  Please help. Thanks!


'This the core code from a dll class that works with a windows form.

        'Get the length of the selected file

        Dim fi As IO.FileInfo = My.Computer.FileSystem.GetFileInfo(filePath)

        Dim fileLength As Long = fi.Length

        'Create the request

        Dim request As HttpWebRequest = _

            DirectCast(HttpWebRequest.Create(address), HttpWebRequest)

        'Configure request

        request.Credentials = New System.Net.NetworkCredential("UserName", "Password")

        request.Method = WebRequestMethods.Http.Put

        request.KeepAlive = True

        request.Timeout = -1

        request.ContentLength = fileLength.ToString()

         'This is required for our WebDav server 

         request.SendChunked = True

         request.Headers.Add("Translate: f")

         request.AllowWriteStreamBuffering = True

         Dim s As IO.Stream = request.GetRequestStream()

        Dim fs As New IO.FileStream(filePath, IO.FileMode.Open, IO.FileAccess.Read)

        Dim byteTransferRate As Integer = 1024     

        Dim bytes(byteTransferRate - 1) As Byte        

        Dim bytesRead As Integer = 0

        Dim totalBytesRead As Long = 0


            bytesRead = fs.Read(bytes, 0, bytes.Length)

            If bytesRead > 0 Then

                totalBytesRead += bytesRead

                'Write to stream

                s.Write(bytes, 0, bytesRead)

            End If

        Loop While bytesRead > 0



        s = Nothing



        fs = Nothing

         'It basically hangs here for over 10 minutes and then produces the error.

         Dim response As HttpWebResponse = DirectCast(request.GetResponse(), _


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Question by:VBRocks
  • 2
LVL 27

Author Comment

ID: 24426880
Oops... The base exception is:

    "An existing connection was forcibly closed by the remote host"

LVL 27

Accepted Solution

VBRocks earned 0 total points
ID: 24503697
Alas...  I found the answer.  I thought it was hopeless, and had to be abandoned.  But it was not hopeless.  I was able to use the following article to make it work:

If you're having the same or similar problem, find out exactly what type of authentication your server is requiring (ie.:  Basic, Digest, Kerberos, Negotiate, NTLM), and then be patient and work through this Miscroft Support page.  It will help you solve your problem, and you will still be able to use the HttpWebRequest class.


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