Re: 401 Error using HttpWebRequest in .NET

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• In reply to: Ryan.Melena_at_gmail.com: "401 Error using HttpWebRequest in .NET"
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Date: Wed, 27 Apr 2005 23:47:39 +0200

Ryan,

You might try to disable the loopback test in Windows 2003SP1. This helped
for me for a similar behaviour.
For details see Microsoft KB896861 at
http://support.microsoft.com/default.aspx?scid=kb;en-us;896861

Stefan.

<Ryan.Melena@gmail.com> wrote in message
news:1114615605.221290.177140@g14g2000cwa.googlegroups.com...
> Hello all,
>
> I'm experiencing a very sporadic error since our company upgraded our
> intranet server to IIS6 (win2k3 sp1). The problem is stemming from an
> HttpWebRequest made in one of my .NET applications which is attempting
> to include the contents of a web page in an email. I have attempted
> sending credentials in different ways as shown below (both of which
> worked without problem on IIS5 and win2k):
>
> <CODE>
> HttpWebRequest webRequest = (HttpWebRequest)HttpWebRequest.Create(url);
> webRequest.PreAuthenticate = true;
>
> // Way 1:
> webRequest.Credentials = CredentialCache.DefaultCredentials;
>
> // Way 2:
> webRequest.Credentials = new
> NetworkCredential("username","password","domain");
>
> HttpWebResponse webResponse =
> (HttpWebResponse)webRequest.GetResponse();
> StreamReader sr = new StreamReader(webResponse.GetResponseStream());
> </CODE>
>
> In both cases many requests are successful and the e-mail is sent
> without a hitch. Other times, however, the request fails with a 401
> error and an exception is thrown. Examples of the log file for each
> case are shown below (HttpWebRequests followed by POST of page making
> the request).
>
> <SUCCESS>
> 2005-04-27 13:32:51 172.22.2.42 GET
> /Apps/JobCreate/jobdetails_popup.aspx jobid=3030 80 - 172.22.2.42 - 401
> 2 2148074254
> 2005-04-27 13:32:51 172.22.2.42 GET
> /Apps/JobCreate/jobdetails_popup.aspx jobid=3030 80 EGAN\rjm
> 172.22.2.42 - 200 0 0
> 2005-04-27 13:32:51 172.22.2.42 POST /Apps/JobCreate/index.aspx - 80
> EGAN\gdp 172.22.2.104
> Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0;+.NET+CLR+1.1.4322)
> 200 0 0
> </SUCCESS>
>
> <FAILURE>
> 2005-04-27 14:58:22 172.22.2.42 GET
> /Apps/JobCreate/jobdetails_popup.aspx jobid=3033 80 - 172.22.2.42 - 401
> 1 0
> 2005-04-27 14:58:22 172.22.2.42 GET
> /Apps/JobCreate/jobdetails_popup.aspx jobid=3033 80 - 172.22.2.42 - 401
> 1 2148074252
> 2005-04-27 14:58:22 172.22.2.42 POST /Apps/JobCreate/index.aspx - 80
> EGAN\sks 172.22.4.116
> Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.0) 200 0 0
> </FAILUR>
>
> As can be seen from the log file, the same page is being requested in
> every case (with only a different parameter in the URL). There are no
> errors on the page being requested as it can be visited directly
> without a problem.
>
> The IIS Application is set to allow Integrated Windows Authentication
> only (because I need to grab the user's login name for other purposes).
>
> The problem does not seem to be linked to any particular user or
> computer which is the thing that is really confusing me. It seems to
> happen almost at random.
>
> Any help that anyone could offer would be greatly apprecaited!
>
> Thank you,
> Ryan
>

• Previous message: Jeff Cochran: "Re: How to remove version of IIS 6.0 on Windows 2003 Server?"
• In reply to: Ryan.Melena_at_gmail.com: "401 Error using HttpWebRequest in .NET"
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