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dotnet 1.1 SP1 - HttpWebRequest - Protocol Violation Messages   Related Types This message was discovered on microsoft.public.dotnet.framework. Responses highlighted in red are from those people who are likely to be able to contribute good, authoratitive information to this discussion. They include Microsoft employees, MVP's and others who IMHO contribute well to these kinds of discussions. Post a new message to this list... cguthri mc (VIP) Hello, I have a client-server application I have developed that has been working fine for over a year, but after any of my customers install the SP1 the product no longer works. I installed the SP1 on one of my test machines and found that the program was breaking down when ever it tried to recieve a response from a server. The HttpWebRequest object was failing upon invoking the GetResponse command, stating that there was a protocol violation. What was changed that stops this from working and what can I do to get it to work again? My program is in VB.NET and simply posts ascii information to an ASP page which response.writes a simple ascii string back. Reply to this message...        cguthri mc (VIP) Please if anyone has any information about this let me know. I have sniffed the packets and seen the information is indeed being sent and comes back just like normal, it is just that .NET seem incapable of recognizing a normal page response like it used to be able to do. All test machines and customers who did not install the 1.1 SDK can use my product with no problems. Here is the code I use: Dim strResult As String strResult = "FAILED" Dim URL As String = strURL Dim objUri As New Uri(URL) Dim request As HttpWebRequest = WebRequest.Create(objUri) request.Method = "POST" Dim d As Byte() = System.Text.Encoding.UTF8.GetBytes(strContents) request.ContentLength = d.Length request.Timeout = 400000 Dim newStream As Stream = request.GetRequestStream() newStream.Write(d, 0, d.Length) newStream.Close() Dim response As HttpWebResponse = request.GetResponse() Dim reader As StreamReader = New StreamReader(response.GetResponseStream(), True) strResult = reader.ReadToEnd Return strResult Reply to this message...        cguthri mc (VIP) *correction - All test machines and customers who did not install the 1.1 SDK *SP1* can use my product with no problems. Reply to this message...        Feroze [msft] (VIP) Can you show a sniff of the server response, to see what it looks like ? feroze ================ this posting is provided as-is. "cguthri_mc" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message...        cguthri mc (VIP) Yes, and it looks the same as ever, as per my earlier repsonse. Also in that response I noted that those who have not upgraded to SP1 for .NET 1.1 can use my program just fine. Something in .NET 1.1 is handling things differently, and it seems to deal with the HttpWebRequest object, and moreover specifically, the GetResponse method. "Feroze [msft]" wrote: [Original message clipped] Reply to this message...        cguthri mc (VIP) I've done some more investigating of the packets and have found some things of interest. I sniffed the packets on two of my test machines, which both shared the some connection on the same swtich. The one with the SP1 had far more "chatter" between intself and the server than the one without the SP1. These are extra TCP sends on the SP1 machine than the other. The window size is far smaller on the SP1 machine than the other,a dn by window I do not mean GUI, I mean the packet windows. The SP1 machine eventually runs out of buffer space and gets a TCP ZERO WINDOW. Something is definetely different with SP1, are there some defaults that have been changed? Is this a bug? Reply to this message...        cguthri mc (VIP) Hello? Is anyone from Microsoft going to respond to my post? HttpWebRequest is behaving differently after installing the SP1 for .NET. It keeps getting zero windows when it tries to receive a response from a web page. Reply to this message...        Alvin Bruney [MVP] no, this is public forum. there is no obligation. if you feel the issue is a bug, report it as a bug using this link http://support.microsoft.com/default.aspx?scid=fh;[ln];oasoem -- Regards, Alvin Bruney [ASP.NET MVP http://mvp.support.microsoft.com/default.aspx] Got tidbits? Get it here... http://tinyurl.com/27cok "cguthri_mc" <Click here to reveal e-mail address> wrote in message news:Click here to reveal e-mail address... [Original message clipped] Reply to this message...        cguthri mc (VIP) I see, I had already tried this route but they do not have .NET as an option. When I did try to go through the process using Visual Studio .NET 2003 as the product to report on it hung between form posts at one point and after waiting an hour I gave up and closed the process. When I found this I figured it was moderated my Microsoft, my mistake. I will try to go through the support forms again and maybe this time IE will not hang between forms. "Alvin Bruney [MVP]" wrote: [Original message clipped] Reply to this message...        Jochen Kalmbach =?Utf-8?B?Y2d1dGhyaV9tYw==?= wrote: [Original message clipped] Maybe this is the reason: HTTP response split attacks, HttpWebRequest and the NET Framework 1.1 SP1 http://blogs.msdn.com/gzunino/archive/2004/09/05/225881.aspx -- Greetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ Reply to this message...        cguthri mc (VIP) AHA! That did it! Woohoo! My business is saved. Thanks for that post, but adding the content to the .config file works and all that for now, but is there any sort of "real" solution that could be implemented server side to fix this? Are our servers doing something wrong and need to be updated? "Jochen Kalmbach" wrote: [Original message clipped] Reply to this message...        cguthri mc (VIP) Ahh.... the was indeed a dash left out of a custom http header. That was the cause of this whole mess. Okay, time to wrestle with the server admins. Thanks for all your help! "cguthri_mc" wrote: [Original message clipped] Reply to this message...     System.IO.StreamReader System.Net.HttpWebRequest System.Net.HttpWebResponse System.Net.WebRequest System.Text.Encoding Ad MBR BootFX Best-of-breed application framework for .NET projects, developed by Matthew Baxter-Reynolds and MBR IT

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